Title of Invention	A CATALYST AND A HYDROCARBON OIL CRACKING METHOD
Abstract	The invention discloses a catalyst and a method for cracking hydrocarbons. The catalyst comprises calculated by dry basis 10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder,05~15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive, in which the metal additive is calculated by metal oxide and the P additive is calculated by P2O5. The method for cracking hydrocarbons using this catalyst increases the yield of FCC liquefied petroleum gas (LPG) and the octane number of FCC gasoline as well as it increases the concentration of propylene in LPG dramatically.

Title of Invention

A CATALYST AND A HYDROCARBON OIL CRACKING METHOD

Abstract

The invention discloses a catalyst and a method for cracking hydrocarbons. The catalyst comprises calculated by dry basis 10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder,05~15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive, in which the metal additive is calculated by metal oxide and the P additive is calculated by P2O5. The method for cracking hydrocarbons using this catalyst increases the yield of FCC liquefied petroleum gas (LPG) and the octane number of FCC gasoline as well as it increases the concentration of propylene in LPG dramatically.

Full Text	FORM - 2 THE PATENTS ACT, 1970 (39 OF 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION (Section 10 & rule 13) TITLE A CATALYST AND A HYDROCARBON OIL CRACKING METHOD APPLICANTS Name Nationality Address China Petroleum & Chemical Corporation China 6A Huixin Dong Street, Chaoyang District, Beijing, 100029, P. R. China Name Nationality Address Research Institute of Petroleum Processing, Sinopec China 18 Xueyuan Road, Haidian District, Beijing, 100083, P. R. China PREAMBLE TO THE DESCRIPTION: The following Specification particularly describes the invention and the manner in which it is to be performed. A CATALYST AND A HYDROCARBON OIL CRACKING METHOD TECHNICAL FIELD The present invention relates to a catalyst and a method for cracking hydrocarbons. More particularly, the present invention relates to a catalyst and a method for cracking hydrocarbons used to increase the concentration of propylene in FCC liquefied petroleum gas (LPG). TECHNICAL BACKGROUND Propylene is an important organic chemical raw material. With the rapid increase of the demand for the derivatives such as polypropylene, the requirement for propylene in the whole world is increased rapidly year by year. Fluid catalytic cracking is one of the most important technologies to produce light olefins and propylene. As for most of the FCC apparatus, using the catalyst or the addition agent containing zeolite with MFI structure is an effective technology in order to increase light olefins and propylene. USP3,758,403 disclosed earlier that the method by adding ZSM-5 zeolite in the FCC catalyst might increase the octane number of gasoline and the yield of C3~C4 olefins. For instance, when adding 1.5, 2.5, 5 and 10% ZSM-5 zeolite to the conventional catalyst with 10% REY molecular sieve, the octane number of gasoline is increased and the yield of low-carbon olefin is increased. The same result could be obtained by using the addition agent with ZSM-5 zeolite. USP5,318,696 disclosed a hydrocarbon conversion technology based on a catalyst which is consisted of a marcoporous zeolite and a zeolite with MFI structure and a Si/Al ratio of lower than 30. This technology is used to produce gasoline with high octane number by employing improved FCC process and increase low-carbon olefins, especially propylene. USP5,997,728 disclosed a method in which a shape-selective 2 cracking addition agent is used in large amount in the FCC process of heavy feedstock. The addition agent comprises the amorphous matrix by adding 12~40% ZSM-5 zeolite, and its inventory in the system is at least 10%, which makes the content of ZSM-5 zeolite in the catalyst higher than 3%. This method increases low-carbon olefins in a large scale, at the same time it doesn't increase the yield of aromatic extraly and lose the yield of gasoline. The cracking activity and hydrothermal stability of ZSM-5 zeolite is increased and the use level of zeolite can be reduced after the modification of ZSM-5 zeolite by phosphorous compounds. CN1049406C disclosed a zeolite with MFI structure which containing P and rare earth. The anhydrous chemical expression is aRE2O3- bNa2O- A1203- cP2Os- dSiO2, in which a=0.01~0.25, b=0.005~0.02, c=0.2~1.0 and d=35~120. This zeolite displays excellent hydrothermal stability and good selectivity of low-carbon olefins when used in the conversion of hydrocarbons at high temperature. CN1034223C disclosed a cracking catalyst used to produce low-carbon olefins, which is consisted of 0~70% clay (based on weight of catalyst), 5~99% inorganic oxide and 1-50% zeolite. The zeolite is the mixture of 0~25wt% REY or high silica Y zeolite and 75~100wt% five membered ring high silica zeolite containing P and rare earth. The catalyst has higher hydrothermal activity and stability, conversion and yield of C2=~C4= than the catalyst using conventional ZSM-5 zeolite as active component. USP5,110,776 disclosed the preparation of ZSM-5 zeolite catalyst modified with P, in which the modification procedure with P is proceeded by dispersing the zeolite into a solution of P compounds at a pH valve of 2~6, mixing with matrix and spray-drying. The obtained catalyst increases the octane number of gasoline, and at the same time it doesn't increase the yield of dry gas and coke. USP6,566,293 disclosed a cracking catalyst comprising P modified ZSM-5 zeolite. The preparation of P modified ZSM-5 zeolite is 3 proceeded by dispersing the zeolite into a solution of P compounds at a pH value of higher than 4.5, in which the loading content of P (calculated by P2Os) is at lease 10wt%, then mixing with matrix and other zeolite components and spray-drying. The obtained catalyst has 5 high yield of low-carbon olefins. USP5,171,921 disclosed a ZSM-5 zeolite modified by P. The Si/Al ratio of the zeolite is 20-60. After the immersion with P compounds and steam-aging treatment at 500-7000, the zeolite displays higher activity than the zeolite without P modification when used ii the 10 conversion of C3~C20 hydrocarbons to C2~C5 olefins. USP6,080,303 disclosed a method used to increase the catalytic activity of microporous and mesoporous zeolites, in which microporous and mesoporous zeolites are treated with P compounds firstly and then combined with A1PO4 gel. This method may improve 15 the activity and hydrothermal stability of microporous and mesoporous zeolites. USP5,472,594 disclosed a hydrocarbon conversion technology based on a catalyst which comprises a marcoporous zeolite and a P modified mesoporous zeolite with MFI structure. This technology is 20 used to produce gasoline with high octane number by employing improved FCC process and increase low-carbon olefins, especially C4/C5. Besides the P modification of ZSM-5 zeolite, the selectivity of the catalyst and addition agent for low-carbon olefins also could be 25 improved by the introduction of P compounds to matrix. USP2002/0003103A1 disclosed a FCC technology employed to increase the yield of propylene, in which at least part of the gasoline products are piped into the second riser reactor and cracked again. Besides marcoporous zeolite such as USY, the catalyst composition 30 used comprises mesoporous zeolite such as ZSM-5 and inorganic binder possessing cracking activity. The inorganic binder component contains F and the P/Al ratio is 0.1-10. This technology may increase 4 low-carbon olefins in a large scale, especially the yield of propylene. USP2002/0049133A1 disclosed a catalyst with high zeolite content and high attrition strength. The catalyst comprises 30~85wt% ZSM-5 zeolite, 6~24wt% P (calculated by P2Os), structures, in which the zeolite is modified by the metal of Group VIII, preferred by Ni. After the introduction of Ni, the zeolite is treated at a controlled temperature under thermal or hydrothermal conditions, which leads to the enrichment of the metal of Group VIII and Al on the surface. When used in the conversion of hydrocarbons, the catalyst may increase the octane number of gasoline and the yield of C3~C4 olefins. CN1057408A disclosed a cracking catalyst containing high Si zeolite and high cracking activity, in which the high Si zeolite is ZSM-5 zeolite, p zeolite or MOR zeolite containing 0.01~3.0wt% P, 0.01~1.0wt% Fe or 0.01~10wt% Al. The high Si zeolite is obtained by heating H- or K-ZSM-5 zeolite, p zeolite or MOR zeolite with a Si/Al ratio of higher than IS to 350-820"C and passing it into an aqueous solution of Al halide, Fe halide or ammonium phosphate at a volume hourly space velocity of 0.1-l0h-1. CN1465527A disclosed a MFI zeolite with P and transition metal. The anhydrous chemical expression of the zeolite, calculated by mass of oxide, is (0-0.3) Na2O (0.5-5) A1203- (1.3-10) P2Os- (0.7-15) M203' (70-97) Si02, in which M is selected from one of the transition metals Fe, Co and Ni. When used in the FCC procedure of petroleum hydrocarbon, the zeolite may increase the yield and selectivity for C2~C4 olefins and result in higher yield of LPG. At present for most of the FCC apparatus, increasing the 5 concentration of propylene in LPG is an important way to increase the economic benefits for FCC apparatus at the same yield of LPG. Although the zeolite materials and catalysts disclosed in the prior art could effectively increase the yield of low-carbon olefins and the octane number of FCC gasoline products when used in FCC process, during the FCC reaction they give out relative low selectivity for propylene, so the scope for increasing propylene concentration in LPG is limited. DISCLOSURE OF THE INVENTION The object of the invention is to provide a new catalyst on the basis of the prior art and a method for cracking hydrocarbons by using this catalyst. The inventor have found that the catalyst, prepared by using the modified MFI zeolite containing P and transition metal as disclosed in CNl465527A as active component, and introducing a proper content of transition metal additive and P additive further, could increase not only the yield of LPG in FCC effectively and the octane number of FCC gasoline, but also increase the concentration of propylene in LPG of FCC dramatically when used in the method for cracking hydrocarbons. Therefore the catalyst supplied by this invention is characterized by that the catalyst comprises, calculated by dry basis, 10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder, 0.5-15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive, in which the metal additive and the P additive are both calculated by oxide. The catalyst supplied by this invention is preferably consisted of, calculated by dry basis, 20~50wt% ZSM-5 zeolite, 10~45wt% clay, 25~50wt% inorganic oxide binder, 1.0~10wt% one or more metal additives selected from the metals of Group VIIIB and 5~15wt% P additive. In which the ZSM-5 zeolite is preferably a ZSM-5 zeolite modified by P and one of the metals selected from Fe, Co and Ni. The anhydrous chemical expression, calculated by oxide, is (0-0.3) Na2O- (0.5~5)Al2O3- (1.3~10)P2O5- (0.7-15)MxOy- (70~97)SiO2, in which x is the atom number of M and y is a number needed to satisfy the oxidation state of M. In preferred condition, the modified ZSM-5 S zeolite is modified by P and Fe, and the anhydrous chemical expression, calculated by oxide, is (0-0.2) Na2O (0.9-3.5) A1203- (1.5-7) P2Os- (0.9-10) M,Oy- (82-92)Si02. In the catalyst supplied by this invention, the contents of metal additive of Group VIIIB and P additive do not include the contents of transition metal and P in the modified ZSM-5 zeolite. In the catalyst supplied by this invention, under preferred condition, the metal of Group VIIIB is selected from one or more of Fe, Co and Ni, more preferably Fe. When using Fe as additive, the XRD patterns of the catalyst comprises at least the characteristic diffraction peaks of FePO species at 20=16.35±0.5°, 28=26.12±0.5° and 26=30.94±0.5°. In the catalyst supplied by this invention, the clay is well known for the technicians in the art and there is no special limitation to it in this invention. It could be selected from one or mixture of more than one of kaolin, metakaolin, sepiolite, attapulgite clay, montmorillonite, rectorite, diatomite, halloysite, steatite, bentonite, hydrotalcites, preferably from one or mixture of more than one of kaolin, metakaolinm, diatomite, sepiolite, attapulgite clay, montmorillonite and rectorite. The inorganic oxide binder is selected from one or more of the inorganic oxides used as matrix and binder component of catalyst, which are well known for the technicians in the art and there is no special limitation to it in this invention. It is selected from one or mixture of more than one of pseudoboehmite, alumina sol, silica- alumina sol, water glass and phosphorus-alumina sol, preferably from one or mixture of more than one of pseudoboehmite, alumina sol and phosphorus-alumina sol. When the addition agent has phosphorus- 7 alumina sol, the content of P in the phosphorus-alumina sol, calculated by P2 O5, is added into the content of P additive. The catalyst supplied by this invention could be prepared from zeolite, clay and inorganic oxide binder through any methods disclosed in the existing preparation technologies of cracking catalyst such as spray-drying process, and there is no special limitation in this invention. The transition metal additives of Group VIIIB exist in the form of their oxide, phosphate, phosphite, basic phosphate, acid phosphate. One or more of the inorganic compounds and organic compounds of the transition metal could be easy to dissolve in water, or hard to dissolve or insoluble in water. The examples of the transition metal compounds include their oxide, hydroxide, chloride, nitrate, sulphate, phosphate and their organic compounds, etc. The preferred transition metal compounds are selected from one or more of their chloride, nitrate, sulphate and phosphate. The transition metal additive of Group VIIIB is preferably introduced by adding transition metal compounds to the slurry in any step before spray-drying in the preparation process of the catalyst. It also can be introduced after spray-drying through immersion or chemical adsorption of transition metal compounds and calcination process, including to immerse the catalyst with a aqueous solution of transition metal compounds or to treat it by chemical adsorption method, then to separate the solid and the liquid (if needed), and to dry and calcine. The drying temperature is from room temperature to 4001), preferred 100-300V. The calcination temperature is 400-700TC, preferred 450-650 "C. The calcination time is 0.5~100h, preferred 0.5~10h. So the transition metal additive may exist in any possible positions of the catalyst, such as the internal channel of the zeolite, the surface of the zeolite, the matrix, or exist in the internal channel of the zeolite, the surface of the zeolite and the matrix simultaneously, preferred in 8 the matrix. In the catalyst supplied by this invention, the P additive exists in the form of phosphorous compounds (such as the oxide of phosphorus, phosphate, phosphite, basic phosphate and acid phosphate). The P additive can be introduced into the catalyst by one of the following methods or the combination of the following methods, but not limited to these methods: 1. Adding phosphorous compounds to the slurry before spray-drying process; 2. Introduced into the catalyst by the inorganic oxide binder. For instance, when the inorganic oxide binder containing phosphorus-alumina sol, after the catalyst is calcined, P is introduced into the catalyst. The phosphorus-alumina sol could also be used as matrix and binder, so this part of P also belongs to the P additive supplied by this invention. 3. Introduced into the catalyst after spray-drying process through immersion or chemical adsorption of phosphorous compounds, solid-liquid separation (if needed), drying and calcination process. The drying temperature is from room temperature to 400 "C, preferred 100-300 "C. The calcination temperature is 400~700 TC, preferred 450-650X2. The calcination time is 0.5-100h, preferred 0.5-1 Oh. So the P additive may exist in any possible positions of the catalyst, such as the internal channel of the zeolite, the surface of the zeolite, in the matrix, or exist in the internal channel of the zeolite, the surface of the zeolite and the matrix simultaneously. In the preparation method of the catalyst supplied by this invention, the phosphorous compounds are selected from one or more of the inorganic compounds and organic compounds of phosphorus. The phosphorous compounds could be easy to dissolve in water, or hard to dissolve or insoluble in water. The examples of the phosphorous compounds include the oxide of phosphorus, phosphoric acid, phosphate, phosphite,_hypophosphite and organic compounds of 9 phosphorus. The preferred phosphorous compounds are selected from one or more of H3PO4, (NH4)3P04, (NH4)H2PO4, (NH4)2HPO4, AlPO4 and phosphorus-alumina sol. A method for cracking hydrocarbons using above catalysts is also supplied in this invention, in which hydrocarbons are contacted with a mixture of catalysts mentioned above under cracking condition, and then the cracked products are collected. In the cracking method supplied by this invention, the contact of the hydrocarbons and the mixture of catalysts could be proceeded in all kinds of reactors. The reactor could be a riser reactor, a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, preferably the reactor is the riser reactor. The contact conditions include a contact temperature of 400-650 TC, preferred 420-600 TC, and a catalyst-to-oil ratio (the weight ratio of catalyst to hydrocarbon) of 1~25, preferred 3~20. As for a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, the contact condition also includes the weight hourly space velocity of 10~120h"!, preferred 15~80h"1. But for a riser reactor the contact condition further includes the reaction time of 0.5-15s, preferably 0.5-10s. In the cracking method supplied by this invention, the mixture of catalysts containing the catalysts mentioned above are consisted mainly of a main cracking catalyst and the catalyst mentioned above and the content of them is well known for the technicians in the art. In general, in the mixture of catalysts the content of the main cracking catalyst is 70-99wt%, preferred 80~95wt%, and the content of the catalyst supplied by this invention is l~30wt%, preferably 3~20wt%. In the catalyst mixture, the type and the composition of the main cracking catalyst is well known for the technicians in this area, which 30 may be all kinds of cracking catalysts, such as all kinds of cracking catalyst containing zeolite. In the cracking method supplied by this invention, the 10 hydrocarbons are selected from one or more of all kinds of petroleum cuts, such as crude oil, atmospheric residuum, vacuumed residuum, atmospheric gas oil, vacuumed gas oil, straight run gas oil, propane deasphalted oil, coking gas oil and liquefied products of coal. The hydrocarbons may have heavy metal impurities such as Ni and V, and impurities of S and N, in which the content of S can reach 3.0wt%, the content of N can be up to 2.0wt%, the content of metal impurities such as V and Ni can be as high as 3000ppm. In the cracking method supplied by this invention, the mixture of catalysts could be used onetime, but in a preferred situation the mixture of catalysts are regenerated and used cyclically. The regeneration of the catalyst mixture is a process that the coke in the catalyst mixture is calcined under oxygen atmosphere which in general is air, as is well known for the technicians in the art. For instance, generally the regeneration temperature is 600~770 "C , preferred 650~7301C. When the contact procedure of the hydrocarbons and the catalyst mixture is proceeded on a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, the regeneration could be finished by piping oxygen-containing atmosphere in situ. When the contact procedure of the hydrocarbons and the catalyst mixture is proceeded on a riser reactor, the regeneration could be finished by using the existing reaction-regeneration system. The existing reaction-regeneration system and the regenerator of FCC are summarized at pages 282-338 in «The processing technique of residuum» (Li Chunnian, Sinopec. Publishing company, 2002). The catalyst supplied by this invention by adding a proper content of the transition metal additive of Group VIIIB and the P additive, especially the samples using modified ZSM-5 zeolite as active component simultaneously, may increase the selectivity for propylene in FCC process, and consequently increase the concentration of propylene in LPG of FCC dramatically. For instance, the content of propylene in the products is increased by 0.76~4.05% (Tables 3, 4, 5), 11 the concentration of propylene in LPG is increased to higher than 35.70wt%. Brief description of drawings Figure l~Figure 5 are the XRD patterns for the catalysts and the comparative catalysts prepared by the examples and the comparative examples. Examples The following examples are used to explain the invention, which is not a limitation to the invention. In the examples and comparative examples, the eight modified ZSM-5 samples A1~A8 are prepared according to the method disclosed in CN1465527A. The anhydrous chemical expressions are obtained on the basis of the chemical composition of the zeolite measured by X-ray fluoroscopy. Sample A,: 0.04Na2O-3.57Al2O3-4.0P2O5-2.4Fe2O3'90.49SiO2. Sample A2: 0.1Na2O-5.0Al2O3-2.0P2O50.9Fe2O3-92SiO2. Sample A3: 0.1Na2O-5.3Al2O31.5P2O5l.lFe2O3-92SiO2. Sample A4: 0.03Na2O-2.2Al2O3-4.9P2Os-2.1Fe2O3-90.8SiO2. Sample A^ 0.1Na2O0.94Al2O3-5.1P2Os10.1Fe2O3-84SiO2. Sample A6: 0.03Na20-5.1Al203-4.8P2Os-3.6Co203-86.5Si02. Sample A7: 0.1Na2O-4.6Al2O3-6.9P2Os-MNi2O3.82SiO2. Sample A8: 0.1Na2O-5.2Al2O3-4.5P2O5-2.0Ni2O3-88.2SiO2. 25 Pseudoboehmite is an industry product of Shandong Alumina Company with a solid content of 60wt%. Alumina sol is an industry product of Qilu Catalyst Factory with an A1203 content of 21.5wt%. Water glass is an industry product of Qilu Catalyst Factory with a Si02 content of 28.9wt% and a Na2O content of 8.9wt%. kaolin is a 30 kind of special kaolin for cracking catalyst manufactured by Suzhou kaolin Company with a solid content of 78wt%. ZRP-5 zeolite is an industry product with conventional MFI structure manufactured by 12 Qilu Catalyst Factory with a P2Os content of 2.5wt% and a crystallinity of 85wt% as well as a Si/Al ratio of 50. In the examples and comparative examples, the characterization method of the XRD patterns for the catalyst samples is: The XRD patterns were characterized on a D/MAX-IIIA X-Ray Diffractometer (from Rigaku) at 40kV and 40mA using Cu Ka radiation and Ni filter. The sample scans were collected at scan step of 0.02°, step time of Is and diffraction slit of 2mm/2mm/0.2mm. Examples 1-19 are used to explain the preparation of catalyst employed in the method supplied by this invention. Example 1 The preparation of phosphorus-alumina sol: 1.05 kg pseudoboehmite (dry basis) and 3.35 kg deionized water was mixed together and stirred for 30 min, then 4.9 kg concentrated H3PO4 (chemical pure, 85wt% of H3PO4) was added into the slurry under stirring. The obtained slurry was heated to 70V and reacted for 45 min at this temperature to form the colorless and transparent phosphorus-alumina sol with a P205 content of 30.6wt% and an A1203 content of 10.5wt% as well as pH=1.7. 1.75 kg A, (dry basis), 1.4 kg kaolin (dry basis), 0.65 kg pseudoboehmite (dry basis), 6.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3«6H20 solution (having 100 g Fe2O3) was added into the slurry under stirring. The pH value of the slurry is 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500C and exhaust (output) temperature of 180XH. The catalyst ZJ1 with 35wt% A„ 28wt% kaolin, 27.5wt% A1203, 2.0wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by 13 P205) was obtained after the calcination of the microspheres at 500X1 for 1 h. The XRD pattern of this catalyst is shown in Figure 1 as line a, in which the diffraction peaks at 20=16.35°, 20=26.12° and 20=30.94° are 5 the characteristic diffraction peaks of FePO species. Example 2 1.84 kg Aj (dry basis), 1.33 kg kaolin (dry basis), 0.98 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous Fe2O36H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 m.m were obtained by the spray-drying of the slurry at input temperature of 500 oC and exhaust (output) temperature of 180"C. The microspheres with 36.8wt% A„ 26.6wt% kaolin, 31.6wt% A1203 and 5.0wt% Fe additive (calculated by Fe203) were obtained after calcination at 500 oC for 1 h. 1 kg microspheres obtained above (dry basis), 10 L deionized water and 100 g (NH4)2HPO4 were mixed together. The obtained slurry was heated to 60 XT under stirring and reacted for 20 min at this temperature. The slurry was vacuum-filtrated and dried. The catalyst ZJ2 with 35wt% A„ 25.3wt% kaolin, 30wt% A1203, 4.7wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after calination at 500X1! for 2 h. The XRD pattern of this catalyst is shown in Figure 2 as line e, in which the diffraction peaks at 20=16.37°, 20=26.22° and 20=30.90° are the characteristic diffraction peaks of FePO species. Example 3 1.94 kg A, (dry basis), 1.91 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and 14 stirred for 120 min, then 1 L aqueous FeCl3«6H20 solution (having 550 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 urn were obtained by the 5 spray-drying of the slurry at input temperature of 500X? and exhaust temperature of 180 oC. The microspheres with 38.8wt% A„ 50.2wt% A1203 and 11wt% Fe additive (calculated by Fe203) were obtained after calcination at 500X3 for 1 h. 1 kg microspheres obtained above (dry basis), 10 L deionized water and 210 g (NH4)2HPO4 were mixed together. The obtained slurry was heated to 60X2 under stirring and reacted for 20 min. The slurry was vacuum-filtrated and dried. The catalyst ZJ3 with 35wt% A„ 45.1wt% A1203, 9.9wt% Fe additive (calculated by Fe203) and 10wt% P additive (calculated by P2Os) was obtained after calcination at 500X3 for 2 h. ' The XRD pattern of this catalyst is shown in Figure 2 as line f, in which the diffraction peaks at 20=16.25°, 26=26.18° and 20=30.87° are the characteristic diffraction peaks of FePO species. Example 4 The preparation method is as same as Example 1, but the difference is that the weight of kaolin is 1.25 kg (dry basis) and FeCl3«6H20 solution is replaced by 1 L Co(N03)2-6H20 solution (having 250 g CoO). The catalyst ZJ4 was obtained with 35wt% A„ 25wt% kaolin, 27.5wt% A1203, 5wt% Co additive (calculated by CoO) and 7.5wt% P additive (calculated by P2Os). Example 5 The preparation method is as same as Example 1, but the difference is that the weight of kaolin is 1.25 kg (dry basis) and FeCl3'6H20 solution is replaced by 1 L Ni(N03)2«6H20 solution (having 250 g NiO). The catalyst ZJ5 was obtained with 35wt% A„ 25wt% 15 kaolin, 27.5wt% A1203, 5wt% Ni additive (calculated by NiO) and 7.5wt% P additive (calculated by P2Os) that doesn't include the P component of the modified MFI zeolite. Example 6 1 kg catalyst ZJ1 (dry basis), 10 L deionized water and 157 g (NH4)2HPO4 were heated to 60X3 under stirring and reacted for 20 min at this temperature. The slurry was vacuum-filtrated and dried. The catalyst ZJ6 with 32.38wt% A„ 25.9wt% kaolin, 25.4wt% A1203, 1.85wt% Fe additive (calculated by Fe203) and 14.47wt% P additive (calculated by P2Os) was obtained after calcination at 500X3 for 2 h. The XRD pattern of this catalyst is shown in Figure 2 as line g, in which the diffraction peaks at 20=16.42°, 20=26.08° and 20=30.97° are the characteristic diffraction peaks of FePO species. 15 Example 7 1.75 kg A, (dry basis), 1 kg kaolin (dry basis), 3.46 kg water glass and 5 kg deionized water were mixed together and stirred for 120 min, then 1 L aqueous FeCl3«6H20 solution (having 750 g Fe203) was added 20 into the slurry under stirring. The pH value of the slurry is 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 urn were obtained by the spray-drying of the slurry at input temperature of 500 V and exhaust (output) temperature of 1800. 25 Then the microspheres were calcined at 400 "C for 1 h. 1 kg the above calcined microspheres (dry basis), 10 L deionized water and 100 g NH4Clwere heated to 60"C under stirring, washed for 20 min at this temperature and vacuum-filtrated. The filter cake was washed again according to the above method and dried at 120 XD. The 30 catalyst ZJ7 was obtained with 35wt% A„ 20wt% kaolin, 2.5wt% A1203, 20wt% Si02, 15wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by P2Os). 16 The XRD pattern of this catalyst is shown in Figure 2 as line h, in which the diffraction peaks at 20=16.35°, 20=26.07° and 20=30.88° are the characteristic diffraction peaks of FePO species. Example 8 The catalyst was prepared according to the method of Example 1, but the difference is that the weight of A1 is 2.25 kg (dry basis) and the weight of kaolin is 0.9 kg (dry basis). The catalyst ZJ8 was obtained with 45wt% A„ 18wt% kaolin, 27.5wt% A1203, 2wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by P2Os). The XRD pattern of this catalyst is shown in Figure 3 as line i, in which the diffraction peaks at 20=16.38°, 20=26.20° and 20=30.91° are the characteristic diffraction peaks of FePO species. Example 9 1 kg A, (dry basis), 1.85 kg kaolin (dry basis), 0.9 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3,6H20 solution (having 400 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500t! and exhaust temperature of 180 TC. The catalyst ZJ9 with 20wt% Alf 37wt% kaolin, 30wt% A1203, 8wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 oC for 1 h. The XRD pattern of this catalyst is shown in Figure 3 as line j, in which the diffraction peaks at 20=16.35°, 20=26.07° and 20=30.82° are the characteristic diffraction peaks of FePO species. 17 Example 10 The catalyst was prepared according to the method of Example 9, but the difference is that A, is replaced by A2 with same weight. The catalyst ZJ10 was obtained with 20wt% A2, 37wt% kaolin, 30wt% A1203, 8wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os). The XRD pattern of this catalyst is shown in Figure 3 as line k, in which the diffraction peaks at 29=16.32°, 20=25.97° and 20=30.90° are the characteristic diffraction peaks of FePO species. 10 Example 11 1.25 kg A3 (dry basis), 1 kg kaolin (dry basis), 1.65 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl36H20 solution (having 250 g Fe2O3) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500 "C and exhaust (output) temperature of 1801C. The catalyst ZJ11 with 25wt% A3, 20wt% kaolin, 45wt% A1203, 5wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 T2 for 1 h. The XRD pattern of this catalyst is shown in Figure 3 as line 1, in which the diffraction peaks at 20=16.31°, 20=26.06° and 20=30.92° are the characteristic diffraction peaks of FePO species. Example 12 2 kg A4 (dry basis), 0.75 kg kaolin (dry basis), 1.15 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L 18 aqueous FeCl3-6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 5001C and exhaust temperature of 180 V. The catalyst ZJ12 with 40wt% A4, 15wt% kaolin, 35wt% A1203, 5wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after the calcination of the 10 microspheres at 500 oC for 1 h. The XRD pattern of this catalyst is shown in Figure 4 as line m, in which the diffraction peaks at 20=16.38°, 20=26.02° and 20=30.91° are the characteristic diffraction peaks of FePO species. Example 13 2.89 kg A5 (dry basis), 1.4 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl36H20 solution (containing 105.5 g Fe2O3,) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 um were obtained by the spray-drying of the slurry at input temperature of 500"C and exhaust temperature of 180 oC. The microspheres with 57.89wt% A8, 40wt% A1203 and 2.11wt% Fe additive (calculated by Fe203) were obtained after calcination at 500 oC for 1 h. 1 kg microspheres obtained above (dry basis), 10 L deionized water and 210 g (NH4)2HPO4 were heated to 60"C under stirring and reacted for 20 min at this temperature. The slurry was vacuum-filtrated and dried. The catalyst ZJ13 with 55wt% A5, 38wt% A1203, 2wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after calcination at 500V for 2 h The XRD pattern of this catalyst is shown in Figure 4 as line n, in 19 which the diffraction peaks at 20=16.31°, 29=26.09° and 20=30.80 are the characteristic diffraction peaks of FePO species. Example 14 1.5 kg A6 (dry basis), 1.5 kg kaolin (dry basis), 0.9 kg pseudoboehmite (dry basis), 6.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl36H20 solution (containing 125 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500 oC and exhaust temperature of 180 oC. The catalyst ZJ14 with 30wt% A6, 30wt% kaolin, 30wt% A1203, 2.5wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 oC for 1 h. The XRD pattern of this catalyst is shown in Figure 4 as line o, in which the diffraction peaks at 20=16.30°, 20=26.12° and 20=30.92° are the characteristic diffraction peaks of FePO species. Example 15 1.25 kg A7 (dry basis), 1 kg kaolin (dry basis), 1.65 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3-6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500X1! and exhaust temperature of 180 TC. The catalyst ZJ15 with 25wt% A7, 20wt% kaolin, 45wt% A1203, 5wt% Fe additive (calculated by Fe203) and 5wt% P additive 20 (calculated by P2Os) was obtained after the calcination of the microspheres at 500"C for 1 h. The XRD pattern of this catalyst is shown in Figure 4 as line p, in which the diffraction peaks at 29=16.30°, 29=26.12° and 29=30.99° are 5 the characteristic diffraction peaks of FePO species. Example 16 2.5 kg A8 (dry basis), 1.63 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and 10 stirred for 120 min, then 1 L aqueous FeCl36H20 solution (having 270 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 um were obtained by the spray-drying of the slurry at input temperature of 500"C and exhaust 15 temperature of 180 TC. The microspheres with 50wt% A8, 44.6wt% A1203 and 5.4wt% Fe additive (calculated by Fe203) were obtained after calcination at 500 "C for 1 h. 1 kg microspheres obtained above (dry basis), 10 L deionized water and 210 g (NH4)2HPO4 were heated to 60C under stirring and 20 reacted for 20 min. The slurry was vacuum-filtrated and dried. The catalyst ZJ16 with 45wt% A8, 40.1 wt% A1203, 4.9wt% Fe additive (calculated by Fe^) and 10wt% P additive (calculated by P2Os) was obtained after calcination at 500 V for 2 h. The XRD pattern of this catalyst is shown in Figure 5 as line q, in 25 which the diffraction peaks at 29=16.38°, 29=26.17° and 29=30.93° are the characteristic diffraction peaks of FePO species. Example 17 The catalyst was prepared according to the method of Example 1, but the difference is that A, is replaced by A3 with same weight. The catalyst ZJ17 was obtained with 35wt% A3, 28wt% kaolin, 27.5wt% A1203, 2.0wt% Fe additive (calculated by Fe^-,) and 7.5wt% P 21 additive (calculated by P2Os). The XRD pattern of this catalyst is shown in Figure 5 as line r, in which the diffraction peaks at 20=16.25°, 20=26.12° and 20=30.92° are the characteristic diffraction peaks of FePO species. Example 18 The catalyst was prepared according to the method of Example 1, but the difference is that A, is replaced by A6 with same weight. The catalyst ZJ,„ was obtained with 35wt% A6, 28wt% kaolin, 27.5wt% 10 A1203, 2.0wt% Fe additive (calculated by Fe2O3) and 7.5wt% P additive (calculated by P205). The XRD pattern of this catalyst is shown in Figure 5 as line s, in which the diffraction peaks at 20=16.31°, 20=26.13° and 20=30.91° are the characteristic diffraction peaks of FePO species. 15 Example 19 The catalyst was prepared according to the method of Example 1, but the difference is that A, is replaced by A8 with same weight. The catalyst Z319 was obtained with 35wt% A8, 28wt% kaolin, 27.5wt% A1203, 2.0wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by P2Os). The XRD pattern of this catalyst is shown in Figure 5 as line t, in which the diffraction peaks at 20=16.45°, 20=26.12° and 20=30.92° are the characteristic diffraction peaks of FePO species. Comparative examples 1~5 are used to explain the preparation of comparative catalysts. Comparative Example 1 This comparative example is used to explain the preparation of comparative catalyst containing modified ZSM-5 zeolite (sample A,) and P additive, but without metal additive of Group VIIIB. 22 1.75 kg A, (dry basis), 1.5 kg kaolin (dry basis), 0.65 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min. Then 36wt% HC1 was added into the slurry under stirring. The dosage of HC1 results in a pH value of the slurry of 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 pm were obtained by the spray-drying of the slurry at input temperature of 500 "C and exhaust temperature of 180C. The comparative catalyst CB, with 35wt% A», 30wt% kaolin, 27.5wt% A1203 and 7.5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 "C for 1 h. The XRD pattern of this catalyst is shown in Figure 1 as line c, in which the diffusion diffraction peak at 28=18.50°~23.65° is the characteristic diffraction peak of A1P04 species. Comparative Example 2 This comparative example is used to explain the preparation of comparative catalyst containing modified ZSM-5 zeolite (sample Ax), 20 but without metal additive of Group VIIIB and P additive. 1.75 kg A, (dry basis), 1.5 kg kaolin (dry basis), 1.15 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min. Then 36wt% HC1 was added into the slurry under stirring. The dosage of HC1 25 results in a pH value of the slurry of 3.0. The slurry was stirred for another 45 min. Microspheres with average particle size of 65 pm were obtained by the spray-drying of the slurry at input temperature of 500 1C and exhaust temperature of 180T2. The comparative catalyst CB2 with 35wt% A„ 30wt% kaolin and 35wt% A1203 was obtained after 30 the calcination of the microspheres at 500 "C for 1 h. The XRD pattern of this catalyst is shown in Figure 1 as line d. 23 Comparative Example 3 This comparative example is used to explain the preparation of comparative catalyst containing conventional ZRP-5 zeolite. The catalyst was prepared according to the method of Comparative Example 2, but the difference is that At is replaced by ZRP-5 zeolite with same weight. The comparative catalyst CB3 was obtained with 35wt% ZRP-5 zeolite, 30wt% kaolin and 35wt% A1203. Comparative Example 4 This comparative example is used to explain the preparation of comparative catalyst containing conventional ZRP-5 zeolite and P additive. The catalyst was prepared according to the method of Example 1, but the difference is that A, is replaced by ZRP-5 zeolite with same weight. The comparative catalyst CB4 was obtained with 35wt% ZRP- 5 zeolite, 30wt% kaolin, 35wt% A1203 and 5wt% P additive not including the P of ZRP-5 zeolite. Comparative Example 5 This comparative example is used to explain the preparation of comparative catalyst containing modified ZSM-5 zeolite (sample A,) and metal additive of Group VIIIB, but without P additive. 1.75 kg Aj (dry basis), 1.5 kg kaolin (dry basis), 0.9 kg pseudoboehmite (dry basis), 6.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3*6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 urn were obtained by the spray-drying of the slurry at input temperature of 500 "C and exhaust temperature of 180 1C. The comparative catalyst CB5 with 35wt% A„ 30wt% kaolin, 30wt% A1203 and 5wt% Fe additive (calculated by Fe203) was obtained after the 24 calcination of the microspheres at 500 X^ for 1 h. The XRD pattern of this catalyst is shown in Figure 1 as line b, in which the diffraction peaks at 20=24.11°, 20=33.08°, 20=35.58° and 20=49.40° are the characteristic diffraction peaks of Fe203 species. Examples 20-38 Examples 20-38 are used to explain the method supplied by this invention employed on the fixed fluidized-bed reactor. 30 g Catalysts ZJ1-ZJ19 were subjected to aging treatment 10 respectively at 800"C for 8 h under a 100% steam atmosphere. Then the catalysts ZJ1-ZJ19 after aging treatment were mixed in different content with the commercial FCC ECAT (industry trademark is MLC-500, and its main properties are listed in Table 1). The catalyst mixture was put into the reactor of a small-scaled fixed fluidized-bed 15 reaction apparatus to proceed the catalytic cracking of the feedstock shown in Table 2 (the properties of the feedstock are shown in Table 2). The composition of catalyst mixtures, reaction condition and reaction results are listed in Table 3, Table 4 and Table 5. 20 Comparative Examples 6~11 Comparative Examples 6~11 are used to explain the comparative method employed on the fixed fluidized-bed reactor. The catalytic cracking of the same feedstock is proceeded 25 according to the method of Example 20, but the difference is that the catalyst is 100% commercial FCC ECAT or the mixture of CB,~CB5 and commercial FCC ECAT respectively. The composition of catalyst mixtures used in the comparative method, reaction condition and reaction results are listed in Table 3. 25 26 As seen from Table 3, Table 4 and Table 5, comparing to the method using comparative catalyst, the method supplied by this invention could increase not only the LPG yield of FCC effectively and the octane number of FCC gasoline, but also the concentration of propylene in LPG of FCC dramatically. 27 Table 3 Example No. Comparativ e Example 6 20 Comparativ e Example 7 21 Comparative Example 8 Comparativ e Example 9 Comparative Example 10 Comparative Example 11 Catalyst 100% ECAT 10%^+ 90% ECAT 10%CBt+ 90% ECAT 10%ZJ2+ 90%ECAT 10%CB2+ 90% ECAT 10%CB,+ 90% ECAT 10%CB4+ 90% ECAT 10%CB4+ 90% ECAT Reaction temperature, TC 500 500 500 500 500 500 500 500 WHSV, h1 16 16 16 16 16 16 16 16 Catalyst-to-oil,wt/wt 5.92 5.92 5.92 5.92 5.92 5.92 5.92 5.92 Steam (to crude oil), wt% 0 0 0 0 0 0 0 0 Yields, wt%: Dry gas 1.60 1.59 1.47 1.58 1.70 1.60 1.56 2.10 LPG 18.04 23.21 20.58 23.54 21.37 21.03 20.76 21.29 Cs+ GLN 43.13 37.30 40.09 38.36 39.55 39.88 39.78 38.60 LCO 17.17 17.84 17.46 17.63 17.10 17.04 17.11 17.18 Bottoms 13.61 13.96 14.83 13.25 13.77 14.34 14.60 13.82 Coke 6.45 6.10 5.57 5.64 6.51 6.12 6.19 7.01 Conversion, wt% 69.23 68.20 67.71 69.11 69.13 68.62 68.30 69.00 Examples 39-47 Examples 39-47 are used to explain the method supplied by this invention employed on the riser reactor. Catalysts ZJ1-ZJ5, ZJ10, ZJ11, ZJ14 and ZJ16 were subjected to aging 5 treatment respectively at 80011 for 8 h under a 100% steam atmosphere. Then the catalysts ZJ1-ZJ5, ZJ10, ZJ11, ZJ14 and ZJ16 after aging treatment were mixed in different contents with MLC-500 commercial ECAT. The catalyst mixture was passed into a small-scaled FCC riser reactor continually, at the same time the feedstock 10 shown in Table 2 or the feedstock shown in Table 2 with steam was also passed into continually, which results in the contact of the VGO and the catalyst mixture. Then the catalyst and the reaction product were separated. The separated catalyst was passed into the regenerator to be regenerated, and then the regenerated catalyst was 15 passed back to the riser reactor. The composition of catalyst mixtures (wt%), reaction condition and reaction results are listed in Table 6 and Table 7. Comparative Examples 12-16 Comparative Examples 12-16 are used to explain the comparative method employed on the riser reactor by using comparative catalyst. The catalytic cracking of the same feedstock is proceeded according to the method of Example 39, but the difference is that the catalyst mixture is replaced by 100% commercial FCC ECAT, mixture of CB, and industry FCC ECAT, mixture of CB2 and industry FCC ECAT, mixture of CB3 and commercial FCC ECAT and mixture of CB4 and commercial FCC ECAT respectively. The composition of catalyst mixtures used in comparative method, reaction condition and reaction results are listed in Table 6. The results of Table 6 and Table 7 reveal that, comparing to the comparative method using comparative catalyst, the method supplied by this invention could increase not only the LPG yield of FCC effectively and the octane number of FCC gasoline, but also the 33 concentration of propylene in LPG of FCC dramatically. 34 Claims 1. A catalyst, which comprises, calculated by dry basis, 10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder, 0.5-15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive in which the metal additive and the P additive are calculated by oxide. 2. A catalyst according to claim 1 in which the catalyst is consisted of, calculated by dry basis, 20~50wt% ZSM-5 zeolite, 10~45wt% clay, 25-50wt% inorganic oxide binder, 1.0~10wt% one or more metal additives selected from the metals of Group VIIIB and 5~15wt% P additive. 3. A catalyst according to claim 1 in which the ZSM-5 zeolite is modified by P and one of the metals selected from Fe, Co or Ni, the anhydrous chemical expression, calculated by oxide, is (0-0.3) Na20 (0.5~5)Al2O3- (1.3~10)P2Os- (0.7~15)MxOy- (70~97)SiO2, in which x is the atom number of M and Y is a number needed to satisfy the oxidation state of M. 4. A catalyst according to claim 3 in which the anhydrous chemical expression of ZSM-5 zeolite, calculated by oxide, is (0-0.2) Na2O- (0.9~3.5)Al2O3- (1.5~7)P2Os- (0.9-10)MxOy- (82~92)Si02. 5. A catalyst according to claim 3 in which M is Fe. 6. A catalyst according to claim 1 or 2 in which the metal of Group VIIIB is selected from one or more of Fe, Co and Ni. 7. A catalyst according to claim 6 in which the metal of Group VIIIB is Fe. 8. A catalyst according to claim 7 in which the XRD patterns comprise at least the characteristic diffraction peaks of FePO species at 20=16.35±0.5°, 20=26.12±0.5° and 20=30.94±0.5°. 9. A catalyst according to claim 1 in which the clay is selected from one or mixture of more than one of kaolin, metakaolin, diatomite, sepiolite, attapulgite clay, montmorillonite and rectorite. 39 10. A catalyst according to claim 1 in which the inorganic oxide binder is selected from one or mixture of more than one of pseudoboehmite, alumina sol, silica-alumina sol, water glass and phosphorus-alumina sol. 11. A catalyst according to claim 1 in which the inorganic oxide binder is selected from one or mixture of more than one of pseudoboehmite, alumina sol and phosphorus-alumina sol. 12 . A method .for cracking hydrocarbons in which the hydrocarbons are contacted with a catalyst mixture containing the catalysts disclosed in one of claims 1-11 under the cracking condition, and then the cracked products are collected. 13. A method according to claim 12 in which the contact procedure of hydrocarbons and the catalyst mixture containing the catalysts disclosed in one of claims 1-11 is proceeded on a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, the reaction temperature is 400~650 oC, the catalyst-to-oil weight ratio is 1~25 and the weight hourly space velocity is l0-120h'1. 14. A method according to claim 13 in which the reaction temperature is 420~600,C, the catalyst-to-oil weight ratio is 3~20 and the weight hourly space velocity is 15~80h"15. A method according to claim 12 in which the contact procedure of hydrocarbons and the catalyst mixture containing the catalysts disclosed in one of claims 1-11 is proceeded on a riser reactor, the cracking condition including a reaction temperature of 400~650'C, a catalyst-to-oil weight ratio of 1-25 and a reaction time of 0.5~15s. 16. A method according to claim 15 in which the reaction temperature is 420~600t), the catalyst-to-oil weight ratio is 3~20 and the reaction time is 0.5~10s. 17. A method according to claim 12 in which the content of the catalysts disclosed in one of claims 1-11 in the catalyst mixture is l~30wt%. 18. A method according to claim 17 in which the content of the catalysts disclosed in one of claims 1-11 is 3~20wt%. Abstract The invention discloses a catalyst and a method for cracking hydrocarbons. The catalyst comprises, calculated by dry basis, 10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder, 0.5~15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive, in which the metal additive is calculated by metal oxide and the P additive is calculated by P205. The method for cracking hydrocarbons using this catalyst increases the yield of FCC liquefied petroleum gas (LPG) and the octane number of FCC gasoline, as well as it increases the concentration of propylene in LPG dramatically. 41

Full Text

FORM - 2
THE PATENTS ACT, 1970
(39 OF 1970)
& THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(Section 10 & rule 13)

TITLE

A CATALYST AND A HYDROCARBON OIL CRACKING METHOD

APPLICANTS Name Nationality Address

China Petroleum & Chemical Corporation
China
6A Huixin Dong Street, Chaoyang District,
Beijing, 100029, P. R. China

Name
Nationality
Address

Research Institute of Petroleum Processing, Sinopec
China
18 Xueyuan Road, Haidian District,
Beijing, 100083, P. R. China

PREAMBLE TO THE DESCRIPTION:
The following Specification particularly describes the invention and the manner in
which it is to be performed.

A CATALYST AND A HYDROCARBON OIL CRACKING METHOD
TECHNICAL FIELD
The present invention relates to a catalyst and a method for
cracking hydrocarbons. More particularly, the present invention
relates to a catalyst and a method for cracking hydrocarbons used to
increase the concentration of propylene in FCC liquefied petroleum
gas (LPG).
TECHNICAL BACKGROUND
Propylene is an important organic chemical raw material. With the rapid increase of the demand for the derivatives such as polypropylene, the requirement for propylene in the whole world is increased rapidly year by year. Fluid catalytic cracking is one of the
most important technologies to produce light olefins and propylene. As for most of the FCC apparatus, using the catalyst or the addition agent containing zeolite with MFI structure is an effective technology in order to increase light olefins and propylene.
USP3,758,403 disclosed earlier that the method by adding ZSM-5
zeolite in the FCC catalyst might increase the octane number of gasoline and the yield of C3~C4 olefins. For instance, when adding 1.5, 2.5, 5 and 10% ZSM-5 zeolite to the conventional catalyst with 10% REY molecular sieve, the octane number of gasoline is increased and the yield of low-carbon olefin is increased. The same result could be
obtained by using the addition agent with ZSM-5 zeolite.
USP5,318,696 disclosed a hydrocarbon conversion technology based on a catalyst which is consisted of a marcoporous zeolite and a zeolite with MFI structure and a Si/Al ratio of lower than 30. This technology is used to produce gasoline with high octane number by
employing improved FCC process and increase low-carbon olefins, especially propylene.
USP5,997,728 disclosed a method in which a shape-selective
2

cracking addition agent is used in large amount in the FCC process of heavy feedstock. The addition agent comprises the amorphous matrix by adding 12~40% ZSM-5 zeolite, and its inventory in the system is at least 10%, which makes the content of ZSM-5 zeolite in the catalyst higher than 3%. This method increases low-carbon olefins in a large scale, at the same time it doesn't increase the yield of aromatic extraly and lose the yield of gasoline.
The cracking activity and hydrothermal stability of ZSM-5 zeolite is increased and the use level of zeolite can be reduced after the
modification of ZSM-5 zeolite by phosphorous compounds.
CN1049406C disclosed a zeolite with MFI structure which containing P and rare earth. The anhydrous chemical expression is aRE2O3- bNa2O- A1203- cP2Os- dSiO2, in which a=0.01~0.25, b=0.005~0.02, c=0.2~1.0 and d=35~120. This zeolite displays excellent
hydrothermal stability and good selectivity of low-carbon olefins when used in the conversion of hydrocarbons at high temperature.
CN1034223C disclosed a cracking catalyst used to produce low-carbon olefins, which is consisted of 0~70% clay (based on weight of catalyst), 5~99% inorganic oxide and 1-50% zeolite. The zeolite is the
mixture of 0~25wt% REY or high silica Y zeolite and 75~100wt% five membered ring high silica zeolite containing P and rare earth. The catalyst has higher hydrothermal activity and stability, conversion and yield of C2=~C4= than the catalyst using conventional ZSM-5 zeolite as active component.
USP5,110,776 disclosed the preparation of ZSM-5 zeolite catalyst
modified with P, in which the modification procedure with P is proceeded by dispersing the zeolite into a solution of P compounds at a pH valve of 2~6, mixing with matrix and spray-drying. The obtained catalyst increases the octane number of gasoline, and at the same time
it doesn't increase the yield of dry gas and coke.
USP6,566,293 disclosed a cracking catalyst comprising P modified ZSM-5 zeolite. The preparation of P modified ZSM-5 zeolite is
3

proceeded by dispersing the zeolite into a solution of P compounds at a pH value of higher than 4.5, in which the loading content of P (calculated by P2Os) is at lease 10wt%, then mixing with matrix and other zeolite components and spray-drying. The obtained catalyst has 5 high yield of low-carbon olefins.
USP5,171,921 disclosed a ZSM-5 zeolite modified by P. The Si/Al
ratio of the zeolite is 20-60. After the immersion with P compounds
and steam-aging treatment at 500-700*0, the zeolite displays higher
activity than the zeolite without P modification when used ii the
10 conversion of C3~C20 hydrocarbons to C2~C5 olefins.
USP6,080,303 disclosed a method used to increase the catalytic activity of microporous and mesoporous zeolites, in which microporous and mesoporous zeolites are treated with P compounds firstly and then combined with A1PO4 gel. This method may improve 15 the activity and hydrothermal stability of microporous and mesoporous zeolites.
USP5,472,594 disclosed a hydrocarbon conversion technology based on a catalyst which comprises a marcoporous zeolite and a P modified mesoporous zeolite with MFI structure. This technology is 20 used to produce gasoline with high octane number by employing improved FCC process and increase low-carbon olefins, especially C4/C5.
Besides the P modification of ZSM-5 zeolite, the selectivity of the catalyst and addition agent for low-carbon olefins also could be 25 improved by the introduction of P compounds to matrix.
USP2002/0003103A1 disclosed a FCC technology employed to increase the yield of propylene, in which at least part of the gasoline products are piped into the second riser reactor and cracked again. Besides marcoporous zeolite such as USY, the catalyst composition 30 used comprises mesoporous zeolite such as ZSM-5 and inorganic binder possessing cracking activity. The inorganic binder component contains F and the P/Al ratio is 0.1-10. This technology may increase
4

low-carbon olefins in a large scale, especially the yield of propylene.
USP2002/0049133A1 disclosed a catalyst with high zeolite content and high attrition strength. The catalyst comprises 30~85wt% ZSM-5 zeolite, 6~24wt% P (calculated by P2Os), structures, in which the zeolite is modified by the metal of Group VIII, preferred by Ni. After the introduction of Ni, the zeolite is treated at a controlled temperature under thermal or hydrothermal conditions, which leads to the enrichment of the metal of Group VIII and Al on the surface. When used in the conversion of hydrocarbons, the catalyst
may increase the octane number of gasoline and the yield of C3~C4 olefins.
CN1057408A disclosed a cracking catalyst containing high Si zeolite and high cracking activity, in which the high Si zeolite is ZSM-5 zeolite, p zeolite or MOR zeolite containing 0.01~3.0wt% P,
0.01~1.0wt% Fe or 0.01~10wt% Al. The high Si zeolite is obtained by heating H- or K-ZSM-5 zeolite, p zeolite or MOR zeolite with a Si/Al ratio of higher than IS to 350-820"C and passing it into an aqueous solution of Al halide, Fe halide or ammonium phosphate at a volume hourly space velocity of 0.1-l0h-1.
CN1465527A disclosed a MFI zeolite with P and transition metal.
The anhydrous chemical expression of the zeolite, calculated by mass of oxide, is (0-0.3) Na2O (0.5-5) A1203- (1.3-10) P2Os- (0.7-15) M203' (70-97) Si02, in which M is selected from one of the transition metals Fe, Co and Ni. When used in the FCC procedure of petroleum
hydrocarbon, the zeolite may increase the yield and selectivity for C2~C4 olefins and result in higher yield of LPG.
At present for most of the FCC apparatus, increasing the
5

concentration of propylene in LPG is an important way to increase the economic benefits for FCC apparatus at the same yield of LPG. Although the zeolite materials and catalysts disclosed in the prior art could effectively increase the yield of low-carbon olefins and the octane number of FCC gasoline products when used in FCC process, during the FCC reaction they give out relative low selectivity for propylene, so the scope for increasing propylene concentration in LPG is limited.
DISCLOSURE OF THE INVENTION
The object of the invention is to provide a new catalyst on the
basis of the prior art and a method for cracking hydrocarbons by using this catalyst.
The inventor have found that the catalyst, prepared by using the modified MFI zeolite containing P and transition metal as disclosed in
CNl465527A as active component, and introducing a proper content of transition metal additive and P additive further, could increase not only the yield of LPG in FCC effectively and the octane number of FCC gasoline, but also increase the concentration of propylene in LPG of FCC dramatically when used in the method for cracking
hydrocarbons.
Therefore the catalyst supplied by this invention is characterized by that the catalyst comprises, calculated by dry basis, 10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder, 0.5-15wt% one or more metal additives selected from the metals of
Group VIIIB and 2~25wt% P additive, in which the metal additive and the P additive are both calculated by oxide.
The catalyst supplied by this invention is preferably consisted of, calculated by dry basis, 20~50wt% ZSM-5 zeolite, 10~45wt% clay, 25~50wt% inorganic oxide binder, 1.0~10wt% one or more metal
additives selected from the metals of Group VIIIB and 5~15wt% P additive. In which the ZSM-5 zeolite is preferably a ZSM-5 zeolite modified by P and one of the metals selected from Fe, Co and Ni. The

anhydrous chemical expression, calculated by oxide, is (0-0.3) Na2O- (0.5~5)Al2O3- (1.3~10)P2O5- (0.7-15)MxOy- (70~97)SiO2, in which x is the atom number of M and y is a number needed to satisfy the oxidation state of M. In preferred condition, the modified ZSM-5 S zeolite is modified by P and Fe, and the anhydrous chemical expression, calculated by oxide, is (0-0.2) Na2O (0.9-3.5) A1203- (1.5-7) P2Os- (0.9-10) M,Oy- (82-92)Si02.
In the catalyst supplied by this invention, the contents of metal additive of Group VIIIB and P additive do not include the contents of
transition metal and P in the modified ZSM-5 zeolite.
In the catalyst supplied by this invention, under preferred condition, the metal of Group VIIIB is selected from one or more of Fe, Co and Ni, more preferably Fe. When using Fe as additive, the XRD patterns of the catalyst comprises at least the characteristic diffraction
peaks of FePO species at 20=16.35±0.5°, 28=26.12±0.5° and 26=30.94±0.5°.
In the catalyst supplied by this invention, the clay is well known for the technicians in the art and there is no special limitation to it in this invention. It could be selected from one or mixture of more than
one of kaolin, metakaolin, sepiolite, attapulgite clay, montmorillonite, rectorite, diatomite, halloysite, steatite, bentonite, hydrotalcites, preferably from one or mixture of more than one of kaolin, metakaolinm, diatomite, sepiolite, attapulgite clay, montmorillonite and rectorite.
The inorganic oxide binder is selected from one or more of the
inorganic oxides used as matrix and binder component of catalyst, which are well known for the technicians in the art and there is no special limitation to it in this invention. It is selected from one or mixture of more than one of pseudoboehmite, alumina sol, silica-
alumina sol, water glass and phosphorus-alumina sol, preferably from one or mixture of more than one of pseudoboehmite, alumina sol and phosphorus-alumina sol. When the addition agent has phosphorus-
7

alumina sol, the content of P in the phosphorus-alumina sol, calculated by P2 O5, is added into the content of P additive.
The catalyst supplied by this invention could be prepared from
zeolite, clay and inorganic oxide binder through any methods disclosed
in the existing preparation technologies of cracking catalyst such as
spray-drying process, and there is no special limitation in this
invention.
The transition metal additives of Group VIIIB exist in the form of their oxide, phosphate, phosphite, basic phosphate, acid phosphate.
One or more of the inorganic compounds and organic compounds
of the transition metal could be easy to dissolve in water, or hard to dissolve or insoluble in water. The examples of the transition metal compounds include their oxide, hydroxide, chloride, nitrate, sulphate, phosphate and their organic compounds, etc. The preferred transition
metal compounds are selected from one or more of their chloride, nitrate, sulphate and phosphate.
The transition metal additive of Group VIIIB is preferably introduced by adding transition metal compounds to the slurry in any step before spray-drying in the preparation process of the catalyst. It
also can be introduced after spray-drying through immersion or chemical adsorption of transition metal compounds and calcination process, including to immerse the catalyst with a aqueous solution of transition metal compounds or to treat it by chemical adsorption method, then to separate the solid and the liquid (if needed), and to
dry and calcine. The drying temperature is from room temperature to 4001), preferred 100-300V. The calcination temperature is 400-700TC, preferred 450-650 "C. The calcination time is 0.5~100h, preferred 0.5~10h.
So the transition metal additive may exist in any possible positions
of the catalyst, such as the internal channel of the zeolite, the surface of the zeolite, the matrix, or exist in the internal channel of the zeolite, the surface of the zeolite and the matrix simultaneously, preferred in
8

the matrix.
In the catalyst supplied by this invention, the P additive exists in the form of phosphorous compounds (such as the oxide of phosphorus, phosphate, phosphite, basic phosphate and acid phosphate). The P additive can be introduced into the catalyst by one of the following methods or the combination of the following methods, but not limited to these methods:
1. Adding phosphorous compounds to the slurry before spray-drying process;
2. Introduced into the catalyst by the inorganic oxide binder. For
instance, when the inorganic oxide binder containing phosphorus-alumina sol, after the catalyst is calcined, P is introduced into the catalyst. The phosphorus-alumina sol could also be used as matrix and binder, so this part of P also belongs to the P additive supplied by this
invention.
3. Introduced into the catalyst after spray-drying process through immersion or chemical adsorption of phosphorous compounds, solid-liquid separation (if needed), drying and calcination process. The drying temperature is from room temperature to 400 "C, preferred
100-300 "C. The calcination temperature is 400~700 TC, preferred 450-650X2. The calcination time is 0.5-100h, preferred 0.5-1 Oh.
So the P additive may exist in any possible positions of the catalyst, such as the internal channel of the zeolite, the surface of the zeolite, in the matrix, or exist in the internal channel of the zeolite, the surface of
the zeolite and the matrix simultaneously.
In the preparation method of the catalyst supplied by this invention, the phosphorous compounds are selected from one or more of the inorganic compounds and organic compounds of phosphorus. The phosphorous compounds could be easy to dissolve in water, or
hard to dissolve or insoluble in water. The examples of the phosphorous compounds include the oxide of phosphorus, phosphoric acid, phosphate, phosphite,_hypophosphite and organic compounds of
9

phosphorus. The preferred phosphorous compounds are selected from one or more of H3PO4, (NH4)3P04, (NH4)H2PO4, (NH4)2HPO4, AlPO4 and phosphorus-alumina sol.
A method for cracking hydrocarbons using above catalysts is also supplied in this invention, in which hydrocarbons are contacted with a mixture of catalysts mentioned above under cracking condition, and then the cracked products are collected.
In the cracking method supplied by this invention, the contact of
the hydrocarbons and the mixture of catalysts could be proceeded in
all kinds of reactors. The reactor could be a riser reactor, a fixed-bed
reactor, a fluidized-bed reactor or a moving-bed reactor, preferably
the reactor is the riser reactor.
The contact conditions include a contact temperature of 400-650 TC, preferred 420-600 TC, and a catalyst-to-oil ratio (the weight ratio of catalyst to hydrocarbon) of 1~25, preferred 3~20.
As for a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, the contact condition also includes the weight hourly space velocity of 10~120h"!, preferred 15~80h"1. But for a riser reactor the contact condition further includes the reaction time of 0.5-15s, preferably 0.5-10s.
In the cracking method supplied by this invention, the mixture of catalysts containing the catalysts mentioned above are consisted mainly of a main cracking catalyst and the catalyst mentioned above and the content of them is well known for the technicians in the art. In general, in the mixture of catalysts the content of the main cracking catalyst is 70-99wt%, preferred 80~95wt%, and the content of the catalyst supplied by this invention is l~30wt%, preferably 3~20wt%.
In the catalyst mixture, the type and the composition of the main cracking catalyst is well known for the technicians in this area, which 30 may be all kinds of cracking catalysts, such as all kinds of cracking catalyst containing zeolite.
In the cracking method supplied by this invention, the
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hydrocarbons are selected from one or more of all kinds of petroleum cuts, such as crude oil, atmospheric residuum, vacuumed residuum, atmospheric gas oil, vacuumed gas oil, straight run gas oil, propane deasphalted oil, coking gas oil and liquefied products of coal. The hydrocarbons may have heavy metal impurities such as Ni and V, and impurities of S and N, in which the content of S can reach 3.0wt%, the content of N can be up to 2.0wt%, the content of metal impurities such as V and Ni can be as high as 3000ppm.
In the cracking method supplied by this invention, the mixture of
catalysts could be used onetime, but in a preferred situation the mixture of catalysts are regenerated and used cyclically. The regeneration of the catalyst mixture is a process that the coke in the catalyst mixture is calcined under oxygen atmosphere which in general is air, as is well known for the technicians in the art. For instance,
generally the regeneration temperature is 600~770 "C , preferred 650~7301C. When the contact procedure of the hydrocarbons and the catalyst mixture is proceeded on a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, the regeneration could be finished by piping oxygen-containing atmosphere in situ. When the contact
procedure of the hydrocarbons and the catalyst mixture is proceeded on a riser reactor, the regeneration could be finished by using the existing reaction-regeneration system. The existing reaction-regeneration system and the regenerator of FCC are summarized at pages 282-338 in «The processing technique of residuum» (Li
Chunnian, Sinopec. Publishing company, 2002).
The catalyst supplied by this invention by adding a proper content of the transition metal additive of Group VIIIB and the P additive, especially the samples using modified ZSM-5 zeolite as active component simultaneously, may increase the selectivity for propylene
in FCC process, and consequently increase the concentration of propylene in LPG of FCC dramatically. For instance, the content of propylene in the products is increased by 0.76~4.05% (Tables 3, 4, 5),
11

the concentration of propylene in LPG is increased to higher than
35.70wt%.
Brief description of drawings
Figure l~Figure 5 are the XRD patterns for the catalysts and the
comparative catalysts prepared by the examples and the comparative examples.
Examples
The following examples are used to explain the invention, which is
not a limitation to the invention.
In the examples and comparative examples, the eight modified
ZSM-5 samples A1~A8 are prepared according to the method disclosed
in CN1465527A. The anhydrous chemical expressions are obtained on
the basis of the chemical composition of the zeolite measured by X-ray
fluoroscopy.
Sample A,: 0.04Na2O-3.57Al2O3-4.0P2O5-2.4Fe2O3'90.49SiO2.
Sample A2: 0.1Na2O-5.0Al2O3-2.0P2O50.9Fe2O3-92SiO2.
Sample A3: 0.1Na2O-5.3Al2O31.5P2O5l.lFe2O3-92SiO2.
Sample A4: 0.03Na2O-2.2Al2O3-4.9P2Os-2.1Fe2O3-90.8SiO2.
Sample A^ 0.1Na2O0.94Al2O3-5.1P2Os10.1Fe2O3-84SiO2.
Sample A6: 0.03Na20-5.1Al203-4.8P2Os-3.6Co203-86.5Si02.
Sample A7: 0.1Na2O-4.6Al2O3-6.9P2Os-MNi2O3.82SiO2.
Sample A8: 0.1Na2O-5.2Al2O3-4.5P2O5-2.0Ni2O3-88.2SiO2.
25 Pseudoboehmite is an industry product of Shandong Alumina
Company with a solid content of 60wt%. Alumina sol is an industry product of Qilu Catalyst Factory with an A1203 content of 21.5wt%. Water glass is an industry product of Qilu Catalyst Factory with a Si02 content of 28.9wt% and a Na2O content of 8.9wt%. kaolin is a 30 kind of special kaolin for cracking catalyst manufactured by Suzhou kaolin Company with a solid content of 78wt%. ZRP-5 zeolite is an industry product with conventional MFI structure manufactured by
12

Qilu Catalyst Factory with a P2Os content of 2.5wt% and a crystallinity of 85wt% as well as a Si/Al ratio of 50.
In the examples and comparative examples, the characterization
method of the XRD patterns for the catalyst samples is:
The XRD patterns were characterized on a D/MAX-IIIA X-Ray
Diffractometer (from Rigaku) at 40kV and 40mA using Cu Ka radiation and Ni filter. The sample scans were collected at scan step of 0.02°, step time of Is and diffraction slit of 2mm/2mm/0.2mm.
Examples 1-19 are used to explain the preparation of catalyst
employed in the method supplied by this invention.
Example 1
The preparation of phosphorus-alumina sol: 1.05 kg
pseudoboehmite (dry basis) and 3.35 kg deionized water was mixed together and stirred for 30 min, then 4.9 kg concentrated H3PO4 (chemical pure, 85wt% of H3PO4) was added into the slurry under stirring. The obtained slurry was heated to 70V and reacted for 45 min at this temperature to form the colorless and transparent
phosphorus-alumina sol with a P205 content of 30.6wt% and an A1203 content of 10.5wt% as well as pH=1.7.
1.75 kg A, (dry basis), 1.4 kg kaolin (dry basis), 0.65 kg pseudoboehmite (dry basis), 6.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L
aqueous FeCl3«6H20 solution (having 100 g Fe2O3) was added into the slurry under stirring. The pH value of the slurry is 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input
temperature of 500*C and exhaust (output) temperature of 180XH. The catalyst ZJ1 with 35wt% A„ 28wt% kaolin, 27.5wt% A1203, 2.0wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by
13

P205) was obtained after the calcination of the microspheres at 500X1 for 1 h.
The XRD pattern of this catalyst is shown in Figure 1 as line a, in which the diffraction peaks at 20=16.35°, 20=26.12° and 20=30.94° are 5 the characteristic diffraction peaks of FePO species.
Example 2
1.84 kg Aj (dry basis), 1.33 kg kaolin (dry basis), 0.98 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg
alumina sol were mixed together and stirred for 120 min, then 1 L aqueous Fe2O3*6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 m.m were obtained by the spray-drying of the slurry at input
temperature of 500 oC and exhaust (output) temperature of 180"C. The microspheres with 36.8wt% A„ 26.6wt% kaolin, 31.6wt% A1203 and 5.0wt% Fe additive (calculated by Fe203) were obtained after calcination at 500 oC for 1 h.
1 kg microspheres obtained above (dry basis), 10 L deionized
water and 100 g (NH4)2HPO4 were mixed together. The obtained slurry was heated to 60 XT under stirring and reacted for 20 min at this temperature. The slurry was vacuum-filtrated and dried. The catalyst ZJ2 with 35wt% A„ 25.3wt% kaolin, 30wt% A1203, 4.7wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was
obtained after calination at 500X1! for 2 h.
The XRD pattern of this catalyst is shown in Figure 2 as line e, in which the diffraction peaks at 20=16.37°, 20=26.22° and 20=30.90° are the characteristic diffraction peaks of FePO species.
Example 3
1.94 kg A, (dry basis), 1.91 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and
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stirred for 120 min, then 1 L aqueous FeCl3«6H20 solution (having 550 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 urn were obtained by the 5 spray-drying of the slurry at input temperature of 500X? and exhaust temperature of 180 oC. The microspheres with 38.8wt% A„ 50.2wt% A1203 and 11wt% Fe additive (calculated by Fe203) were obtained after calcination at 500X3 for 1 h.
1 kg microspheres obtained above (dry basis), 10 L deionized
water and 210 g (NH4)2HPO4 were mixed together. The obtained slurry was heated to 60X2 under stirring and reacted for 20 min. The slurry was vacuum-filtrated and dried. The catalyst ZJ3 with 35wt% A„ 45.1wt% A1203, 9.9wt% Fe additive (calculated by Fe203) and 10wt% P additive (calculated by P2Os) was obtained after calcination at 500X3
for 2 h. '
The XRD pattern of this catalyst is shown in Figure 2 as line f, in which the diffraction peaks at 20=16.25°, 26=26.18° and 20=30.87° are the characteristic diffraction peaks of FePO species.
Example 4
The preparation method is as same as Example 1, but the difference is that the weight of kaolin is 1.25 kg (dry basis) and FeCl3«6H20 solution is replaced by 1 L Co(N03)2-6H20 solution (having 250 g CoO). The catalyst ZJ4 was obtained with 35wt% A„ 25wt%
kaolin, 27.5wt% A1203, 5wt% Co additive (calculated by CoO) and 7.5wt% P additive (calculated by P2Os).
Example 5
The preparation method is as same as Example 1, but the
difference is that the weight of kaolin is 1.25 kg (dry basis) and
FeCl3'6H20 solution is replaced by 1 L Ni(N03)2«6H20 solution (having
250 g NiO). The catalyst ZJ5 was obtained with 35wt% A„ 25wt%
15

kaolin, 27.5wt% A1203, 5wt% Ni additive (calculated by NiO) and 7.5wt% P additive (calculated by P2Os) that doesn't include the P component of the modified MFI zeolite.
Example 6
1 kg catalyst ZJ1 (dry basis), 10 L deionized water and 157 g (NH4)2HPO4 were heated to 60X3 under stirring and reacted for 20 min at this temperature. The slurry was vacuum-filtrated and dried. The catalyst ZJ6 with 32.38wt% A„ 25.9wt% kaolin, 25.4wt% A1203, 1.85wt% Fe additive (calculated by Fe203) and 14.47wt% P additive (calculated by P2Os) was obtained after calcination at 500X3 for 2 h.
The XRD pattern of this catalyst is shown in Figure 2 as line g, in which the diffraction peaks at 20=16.42°, 20=26.08° and 20=30.97° are the characteristic diffraction peaks of FePO species. 15
Example 7
1.75 kg A, (dry basis), 1 kg kaolin (dry basis), 3.46 kg water glass and 5 kg deionized water were mixed together and stirred for 120 min, then 1 L aqueous FeCl3«6H20 solution (having 750 g Fe203) was added 20 into the slurry under stirring. The pH value of the slurry is 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 urn were obtained by the spray-drying of the slurry at input temperature of 500 V and exhaust (output) temperature of 180*0. 25 Then the microspheres were calcined at 400 "C for 1 h.
1 kg the above calcined microspheres (dry basis), 10 L deionized water and 100 g NH4Clwere heated to 60"C under stirring, washed for 20 min at this temperature and vacuum-filtrated. The filter cake was washed again according to the above method and dried at 120 XD. The 30 catalyst ZJ7 was obtained with 35wt% A„ 20wt% kaolin, 2.5wt% A1203, 20wt% Si02, 15wt% Fe additive (calculated by Fe203) and 7.5wt% P additive (calculated by P2Os).
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The XRD pattern of this catalyst is shown in Figure 2 as line h, in which the diffraction peaks at 20=16.35°, 20=26.07° and 20=30.88° are the characteristic diffraction peaks of FePO species.
Example 8
The catalyst was prepared according to the method of Example 1,
but the difference is that the weight of A1 is 2.25 kg (dry basis) and the
weight of kaolin is 0.9 kg (dry basis). The catalyst ZJ8 was obtained
with 45wt% A„ 18wt% kaolin, 27.5wt% A1203, 2wt% Fe additive
(calculated by Fe203) and 7.5wt% P additive (calculated by P2Os).
The XRD pattern of this catalyst is shown in Figure 3 as line i, in which the diffraction peaks at 20=16.38°, 20=26.20° and 20=30.91° are the characteristic diffraction peaks of FePO species.
Example 9
1 kg A, (dry basis), 1.85 kg kaolin (dry basis), 0.9 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3,*6H20 solution (having 400 g Fe203) was added into the
slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500t! and exhaust temperature of 180
TC. The catalyst ZJ9 with 20wt% Alf 37wt% kaolin, 30wt% A1203, 8wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 oC for 1 h.
The XRD pattern of this catalyst is shown in Figure 3 as line j, in
which the diffraction peaks at 20=16.35°, 20=26.07° and 20=30.82° are the characteristic diffraction peaks of FePO species.
17

Example 10
The catalyst was prepared according to the method of Example 9,
but the difference is that A, is replaced by A2 with same weight. The
catalyst ZJ10 was obtained with 20wt% A2, 37wt% kaolin, 30wt%
A1203, 8wt% Fe additive (calculated by Fe203) and 5wt% P additive
(calculated by P2Os).
The XRD pattern of this catalyst is shown in Figure 3 as line k, in which the diffraction peaks at 29=16.32°, 20=25.97° and 20=30.90° are the characteristic diffraction peaks of FePO species. 10
Example 11
1.25 kg A3 (dry basis), 1 kg kaolin (dry basis), 1.65 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L
aqueous FeCl3*6H20 solution (having 250 g Fe2O3) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the
slurry at input temperature of 500 "C and exhaust (output) temperature of 1801C. The catalyst ZJ11 with 25wt% A3, 20wt% kaolin, 45wt% A1203, 5wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 T2 for 1 h.
The XRD pattern of this catalyst is shown in Figure 3 as line 1, in
which the diffraction peaks at 20=16.31°, 20=26.06° and 20=30.92° are the characteristic diffraction peaks of FePO species.
Example 12
2 kg A4 (dry basis), 0.75 kg kaolin (dry basis), 1.15 kg
pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L
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aqueous FeCl3-6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 5001C and exhaust temperature of 180 V. The catalyst ZJ12 with 40wt% A4, 15wt% kaolin, 35wt% A1203, 5wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after the calcination of the 10 microspheres at 500 oC for 1 h.
The XRD pattern of this catalyst is shown in Figure 4 as line m, in which the diffraction peaks at 20=16.38°, 20=26.02° and 20=30.91° are the characteristic diffraction peaks of FePO species.
Example 13
2.89 kg A5 (dry basis), 1.4 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3*6H20 solution (containing 105.5 g Fe2O3,) was added into the slurry under stirring. The pH value
of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 um were obtained by the spray-drying of the slurry at input temperature of 500"C and exhaust temperature of 180 oC. The microspheres with 57.89wt% A8, 40wt% A1203 and 2.11wt% Fe additive (calculated by Fe203) were obtained
after calcination at 500 oC for 1 h.
1 kg microspheres obtained above (dry basis), 10 L deionized water and 210 g (NH4)2HPO4 were heated to 60"C under stirring and reacted for 20 min at this temperature. The slurry was vacuum-filtrated and dried. The catalyst ZJ13 with 55wt% A5, 38wt% A1203,
2wt% Fe additive (calculated by Fe203) and 5wt% P additive (calculated by P2Os) was obtained after calcination at 500V for 2 h The XRD pattern of this catalyst is shown in Figure 4 as line n, in
19
which the diffraction peaks at 20=16.31°, 29=26.09° and 20=30.80* are the characteristic diffraction peaks of FePO species.
Example 14
1.5 kg A6 (dry basis), 1.5 kg kaolin (dry basis), 0.9 kg
pseudoboehmite (dry basis), 6.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3*6H20 solution (containing 125 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. After
stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the slurry at input temperature of 500 oC and exhaust temperature of 180 oC. The catalyst ZJ14 with 30wt% A6, 30wt% kaolin, 30wt% A1203, 2.5wt% Fe additive
(calculated by Fe203) and 7.5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 oC for 1 h.
The XRD pattern of this catalyst is shown in Figure 4 as line o, in which the diffraction peaks at 20=16.30°, 20=26.12° and 20=30.92° are the characteristic diffraction peaks of FePO species.

Example 15
1.25 kg A7 (dry basis), 1 kg kaolin (dry basis), 1.65 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min, then 1 L
aqueous FeCl3-6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0 adjusted by the dosage of HC1. After stirring for another 30 min, 465 g (NH4)2HPO4 was added into the slurry and stirred for 30 min. Microspheres with average particle size of 65 mm were obtained by the spray-drying of the
slurry at input temperature of 500X1! and exhaust temperature of 180 TC. The catalyst ZJ15 with 25wt% A7, 20wt% kaolin, 45wt% A1203, 5wt% Fe additive (calculated by Fe203) and 5wt% P additive
20

(calculated by P2Os) was obtained after the calcination of the microspheres at 500"C for 1 h.
The XRD pattern of this catalyst is shown in Figure 4 as line p, in which the diffraction peaks at 29=16.30°, 29=26.12° and 29=30.99° are 5 the characteristic diffraction peaks of FePO species.
Example 16
2.5 kg A8 (dry basis), 1.63 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and 10 stirred for 120 min, then 1 L aqueous FeCl3*6H20 solution (having 270 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 um were obtained by the spray-drying of the slurry at input temperature of 500"C and exhaust 15 temperature of 180 TC. The microspheres with 50wt% A8, 44.6wt% A1203 and 5.4wt% Fe additive (calculated by Fe203) were obtained after calcination at 500 "C for 1 h.
1 kg microspheres obtained above (dry basis), 10 L deionized water and 210 g (NH4)2HPO4 were heated to 60*C under stirring and 20 reacted for 20 min. The slurry was vacuum-filtrated and dried. The catalyst ZJ16 with 45wt% A8, 40.1 wt% A1203, 4.9wt% Fe additive (calculated by Fe^) and 10wt% P additive (calculated by P2Os) was obtained after calcination at 500 V for 2 h.
The XRD pattern of this catalyst is shown in Figure 5 as line q, in 25 which the diffraction peaks at 29=16.38°, 29=26.17° and 29=30.93° are the characteristic diffraction peaks of FePO species.
Example 17
The catalyst was prepared according to the method of Example 1,
but the difference is that A, is replaced by A3 with same weight. The
catalyst ZJ17 was obtained with 35wt% A3, 28wt% kaolin, 27.5wt%
A1203, 2.0wt% Fe additive (calculated by Fe^-,) and 7.5wt% P
21

additive (calculated by P2Os).
The XRD pattern of this catalyst is shown in Figure 5 as line r, in which the diffraction peaks at 20=16.25°, 20=26.12° and 20=30.92° are the characteristic diffraction peaks of FePO species.

Example 18
The catalyst was prepared according to the method of Example 1,
but the difference is that A, is replaced by A6 with same weight. The
catalyst ZJ,„ was obtained with 35wt% A6, 28wt% kaolin, 27.5wt%
10 A1203, 2.0wt% Fe additive (calculated by Fe2O3) and 7.5wt% P
additive (calculated by P205).
The XRD pattern of this catalyst is shown in Figure 5 as line s, in which the diffraction peaks at 20=16.31°, 20=26.13° and 20=30.91° are the characteristic diffraction peaks of FePO species. 15
Example 19
The catalyst was prepared according to the method of Example 1,
but the difference is that A, is replaced by A8 with same weight. The
catalyst Z319 was obtained with 35wt% A8, 28wt% kaolin, 27.5wt%
A1203, 2.0wt% Fe additive (calculated by Fe203) and 7.5wt% P
additive (calculated by P2Os).
The XRD pattern of this catalyst is shown in Figure 5 as line t, in which the diffraction peaks at 20=16.45°, 20=26.12° and 20=30.92° are the characteristic diffraction peaks of FePO species.

Comparative examples 1~5 are used to explain the preparation of comparative catalysts.
Comparative Example 1
This comparative example is used to explain the preparation of
comparative catalyst containing modified ZSM-5 zeolite (sample A,) and P additive, but without metal additive of Group VIIIB.
22

1.75 kg A, (dry basis), 1.5 kg kaolin (dry basis), 0.65 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min. Then 36wt% HC1 was added into the slurry under stirring. The dosage of HC1 results in a pH value of the slurry of 3.0. After stirring for another 45 min, 1.22 kg phosphorus-alumina sol was added into the slurry and stirred evenly. Microspheres with average particle size of 65 pm were obtained by the spray-drying of the slurry at input temperature of 500 "C and exhaust temperature of 180*C. The comparative catalyst CB,
with 35wt% A», 30wt% kaolin, 27.5wt% A1203 and 7.5wt% P additive (calculated by P2Os) was obtained after the calcination of the microspheres at 500 "C for 1 h.
The XRD pattern of this catalyst is shown in Figure 1 as line c, in which the diffusion diffraction peak at 28=18.50°~23.65° is the
characteristic diffraction peak of A1P04 species.
Comparative Example 2
This comparative example is used to explain the preparation of comparative catalyst containing modified ZSM-5 zeolite (sample Ax), 20 but without metal additive of Group VIIIB and P additive.
1.75 kg A, (dry basis), 1.5 kg kaolin (dry basis), 1.15 kg pseudoboehmite (dry basis), 7.2 kg deionized water and 2.79 kg alumina sol were mixed together and stirred for 120 min. Then 36wt% HC1 was added into the slurry under stirring. The dosage of HC1 25 results in a pH value of the slurry of 3.0. The slurry was stirred for another 45 min. Microspheres with average particle size of 65 pm were obtained by the spray-drying of the slurry at input temperature of 500 1C and exhaust temperature of 180T2. The comparative catalyst CB2 with 35wt% A„ 30wt% kaolin and 35wt% A1203 was obtained after 30 the calcination of the microspheres at 500 "C for 1 h.
The XRD pattern of this catalyst is shown in Figure 1 as line d.
23

Comparative Example 3
This comparative example is used to explain the preparation of comparative catalyst containing conventional ZRP-5 zeolite.
The catalyst was prepared according to the method of Comparative Example 2, but the difference is that At is replaced by ZRP-5 zeolite with same weight. The comparative catalyst CB3 was obtained with 35wt% ZRP-5 zeolite, 30wt% kaolin and 35wt% A1203.
Comparative Example 4
This comparative example is used to explain the preparation of
comparative catalyst containing conventional ZRP-5 zeolite and P additive.
The catalyst was prepared according to the method of Example 1,
but the difference is that A, is replaced by ZRP-5 zeolite with same
weight. The comparative catalyst CB4 was obtained with 35wt% ZRP-
5 zeolite, 30wt% kaolin, 35wt% A1203 and 5wt% P additive not
including the P of ZRP-5 zeolite.
Comparative Example 5
This comparative example is used to explain the preparation of
comparative catalyst containing modified ZSM-5 zeolite (sample A,) and metal additive of Group VIIIB, but without P additive.
1.75 kg Aj (dry basis), 1.5 kg kaolin (dry basis), 0.9 kg pseudoboehmite (dry basis), 6.2 kg deionized water and 2.79 kg
alumina sol were mixed together and stirred for 120 min, then 1 L aqueous FeCl3*6H20 solution (having 250 g Fe203) was added into the slurry under stirring. The pH value of the slurry is 3.0. The slurry was stirred for another 45 min. Then microspheres with average particle size of 65 urn were obtained by the spray-drying of the slurry at input
temperature of 500 "C and exhaust temperature of 180 1C. The comparative catalyst CB5 with 35wt% A„ 30wt% kaolin, 30wt% A1203 and 5wt% Fe additive (calculated by Fe203) was obtained after the
24

calcination of the microspheres at 500 X^ for 1 h.
The XRD pattern of this catalyst is shown in Figure 1 as line b, in which the diffraction peaks at 20=24.11°, 20=33.08°, 20=35.58° and 20=49.40° are the characteristic diffraction peaks of Fe203 species.

Examples 20-38
Examples 20-38 are used to explain the method supplied by this invention employed on the fixed fluidized-bed reactor.
30 g Catalysts ZJ1-ZJ19 were subjected to aging treatment 10 respectively at 800"C for 8 h under a 100% steam atmosphere. Then the catalysts ZJ1-ZJ19 after aging treatment were mixed in different content with the commercial FCC ECAT (industry trademark is MLC-500, and its main properties are listed in Table 1). The catalyst mixture was put into the reactor of a small-scaled fixed fluidized-bed 15 reaction apparatus to proceed the catalytic cracking of the feedstock shown in Table 2 (the properties of the feedstock are shown in Table
2).
The composition of catalyst mixtures, reaction condition and reaction results are listed in Table 3, Table 4 and Table 5. 20
Comparative Examples 6~11
Comparative Examples 6~11 are used to explain the comparative method employed on the fixed fluidized-bed reactor.
The catalytic cracking of the same feedstock is proceeded 25 according to the method of Example 20, but the difference is that the catalyst is 100% commercial FCC ECAT or the mixture of CB,~CB5 and commercial FCC ECAT respectively.
The composition of catalyst mixtures used in the comparative method, reaction condition and reaction results are listed in Table 3.
25

26

As seen from Table 3, Table 4 and Table 5, comparing to the
method using comparative catalyst, the method supplied by this
invention could increase not only the LPG yield of FCC effectively and
the octane number of FCC gasoline, but also the concentration of
propylene in LPG of FCC dramatically.
27

Table 3
Example No. Comparativ e Example 6 20 Comparativ e Example 7 21 Comparative Example 8 Comparativ e Example 9 Comparative Example 10 Comparative Example 11
Catalyst 100% ECAT 10%^+ 90% ECAT 10%CBt+ 90% ECAT 10%ZJ2+ 90%ECAT 10%CB2+ 90% ECAT 10%CB,+ 90% ECAT 10%CB4+ 90% ECAT 10%CB4+ 90% ECAT
Reaction temperature, TC 500 500 500 500 500 500 500 500
WHSV, h1 16 16 16 16 16 16 16 16
Catalyst-to-oil,wt/wt 5.92 5.92 5.92 5.92 5.92 5.92 5.92 5.92
Steam (to crude oil), wt% 0 0 0 0 0 0 0 0
Yields, wt%:
Dry gas 1.60 1.59 1.47 1.58 1.70 1.60 1.56 2.10
LPG 18.04 23.21 20.58 23.54 21.37 21.03 20.76 21.29
Cs+ GLN 43.13 37.30 40.09 38.36 39.55 39.88 39.78 38.60
LCO 17.17 17.84 17.46 17.63 17.10 17.04 17.11 17.18
Bottoms 13.61 13.96 14.83 13.25 13.77 14.34 14.60 13.82
Coke 6.45 6.10 5.57 5.64 6.51 6.12 6.19 7.01
Conversion, wt% 69.23 68.20 67.71 69.11 69.13 68.62 68.30 69.00

Examples 39-47
Examples 39-47 are used to explain the method supplied by this invention employed on the riser reactor.
Catalysts ZJ1-ZJ5, ZJ10, ZJ11, ZJ14 and ZJ16 were subjected to aging 5 treatment respectively at 80011 for 8 h under a 100% steam atmosphere. Then the catalysts ZJ1-ZJ5, ZJ10, ZJ11, ZJ14 and ZJ16 after aging treatment were mixed in different contents with MLC-500 commercial ECAT. The catalyst mixture was passed into a small-scaled FCC riser reactor continually, at the same time the feedstock 10 shown in Table 2 or the feedstock shown in Table 2 with steam was also passed into continually, which results in the contact of the VGO and the catalyst mixture. Then the catalyst and the reaction product were separated. The separated catalyst was passed into the regenerator to be regenerated, and then the regenerated catalyst was 15 passed back to the riser reactor. The composition of catalyst mixtures (wt%), reaction condition and reaction results are listed in Table 6 and Table 7.
Comparative Examples 12-16
Comparative Examples 12-16 are used to explain the comparative
method employed on the riser reactor by using comparative catalyst.
The catalytic cracking of the same feedstock is proceeded
according to the method of Example 39, but the difference is that the
catalyst mixture is replaced by 100% commercial FCC ECAT, mixture
of CB, and industry FCC ECAT, mixture of CB2 and industry FCC
ECAT, mixture of CB3 and commercial FCC ECAT and mixture of
CB4 and commercial FCC ECAT respectively. The composition of
catalyst mixtures used in comparative method, reaction condition and
reaction results are listed in Table 6.
The results of Table 6 and Table 7 reveal that, comparing to the
comparative method using comparative catalyst, the method supplied
by this invention could increase not only the LPG yield of FCC
effectively and the octane number of FCC gasoline, but also the
33

concentration of propylene in LPG of FCC dramatically.
34

Claims
1. A catalyst, which comprises, calculated by dry basis, 10~65wt%
ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder,
0.5-15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive in which the metal additive and the P additive are calculated by oxide.
2. A catalyst according to claim 1 in which the catalyst is consisted
of, calculated by dry basis, 20~50wt% ZSM-5 zeolite, 10~45wt% clay,
25-50wt% inorganic oxide binder, 1.0~10wt% one or more metal additives selected from the metals of Group VIIIB and 5~15wt% P additive.
3. A catalyst according to claim 1 in which the ZSM-5 zeolite is
modified by P and one of the metals selected from Fe, Co or Ni, the
anhydrous chemical expression, calculated by oxide, is (0-0.3) Na20 (0.5~5)Al2O3- (1.3~10)P2Os- (0.7~15)MxOy- (70~97)SiO2, in which x is the atom number of M and Y is a number needed to satisfy the oxidation state of M.
4. A catalyst according to claim 3 in which the anhydrous
chemical expression of ZSM-5 zeolite, calculated by oxide, is (0-0.2)
Na2O- (0.9~3.5)Al2O3- (1.5~7)P2Os- (0.9-10)MxOy- (82~92)Si02.
5. A catalyst according to claim 3 in which M is Fe.
6. A catalyst according to claim 1 or 2 in which the metal of Group
VIIIB is selected from one or more of Fe, Co and Ni.
7. A catalyst according to claim 6 in which the metal of Group
VIIIB is Fe.
8. A catalyst according to claim 7 in which the XRD patterns
comprise at least the characteristic diffraction peaks of FePO species
at 20=16.35±0.5°, 20=26.12±0.5° and 20=30.94±0.5°.
9. A catalyst according to claim 1 in which the clay is selected
from one or mixture of more than one of kaolin, metakaolin, diatomite,
sepiolite, attapulgite clay, montmorillonite and rectorite.
39

10. A catalyst according to claim 1 in which the inorganic oxide
binder is selected from one or mixture of more than one of
pseudoboehmite, alumina sol, silica-alumina sol, water glass and
phosphorus-alumina sol.
11. A catalyst according to claim 1 in which the inorganic oxide
binder is selected from one or mixture of more than one of pseudoboehmite, alumina sol and phosphorus-alumina sol.
12 . A method .for cracking hydrocarbons in which the hydrocarbons are contacted with a catalyst mixture containing the catalysts disclosed in one of claims 1-11 under the cracking condition, and then the cracked products are collected.
13. A method according to claim 12 in which the contact
procedure of hydrocarbons and the catalyst mixture containing the
catalysts disclosed in one of claims 1-11 is proceeded on a fixed-bed
reactor, a fluidized-bed reactor or a moving-bed reactor, the reaction temperature is 400~650 oC, the catalyst-to-oil weight ratio is 1~25 and the weight hourly space velocity is l0-120h'1.
14. A method according to claim 13 in which the reaction
temperature is 420~600,C, the catalyst-to-oil weight ratio is 3~20 and
the weight hourly space velocity is 15~80h"15. A method according to claim 12 in which the contact
procedure of hydrocarbons and the catalyst mixture containing the
catalysts disclosed in one of claims 1-11 is proceeded on a riser reactor,
the cracking condition including a reaction temperature of 400~650'C,
a catalyst-to-oil weight ratio of 1-25 and a reaction time of 0.5~15s.
16. A method according to claim 15 in which the reaction
temperature is 420~600t), the catalyst-to-oil weight ratio is 3~20 and
the reaction time is 0.5~10s.
17. A method according to claim 12 in which the content of the
catalysts disclosed in one of claims 1-11 in the catalyst mixture is
l~30wt%.
18. A method according to claim 17 in which the content of the
catalysts disclosed in one of claims 1-11 is 3~20wt%.

Abstract
The invention discloses a catalyst and a method for cracking hydrocarbons. The catalyst comprises, calculated by dry basis,
10~65wt% ZSM-5 zeolite, 0~60wt% clay, 15~60wt% inorganic oxide binder, 0.5~15wt% one or more metal additives selected from the metals of Group VIIIB and 2~25wt% P additive, in which the metal additive is calculated by metal oxide and the P additive is calculated by P205. The method for cracking hydrocarbons using this catalyst
increases the yield of FCC liquefied petroleum gas (LPG) and the octane number of FCC gasoline, as well as it increases the concentration of propylene in LPG dramatically.
41

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Patent Number

251207

Indian Patent Application Number

1122/MUMNP/2007

PG Journal Number

09/2012

Publication Date

02-Mar-2012

Grant Date

01-Mar-2012

Date of Filing

26-Jul-2007

Name of Patentee

CHINA PETROLEUM & CHEMICAL CORPORATION

Applicant Address

6A HUIXIN DONG STREET,CHAOYANG DISTRICT, BEIJING,100029,P.R.CHINA

Inventors:

#	Inventor's Name	Inventor's Address
1	LONG JUN	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
2	JIANG WENBIN	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
3	XU MINGDE	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
4	TIAN HUIPING	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
5	LUO YIBIN	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
6	SHU XINGTIAN	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
7	ZHANG JIUSHUN	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
8	CHEN BEIYAN	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA
9	SONG HAITAO	18 XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING 100083, P.R.CHINA

PCT International Classification Number

B01J29/42

PCT International Application Number

PCT/CN2005/002338

PCT International Filing date

2005-12-28

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	200410102810.4	2004-12-28	China
2	200410102813.8	2004-12-28	China