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A cracking catalyst, which contains alumina, phosphorus and molecular sieve, with or without clay, wherein said alumina is η-alumina or a mixture of η-alumina and χ-alumina and/or γ-alumina, and wherein the catalyst contains, on the basis of the total amount of the catalyst, 0.5-50 wt % of η-alumina

A cracking catalyst, which contains alumina, phosphorus and molecular sieve, with or without clay, wherein said alumina is η-alumina or a mixture of η-alumina and χ-alumina and/or γ-alumina, and wherein the catalyst contains, on the basis of the total amount of the catalyst, 0.5-50 wt % of η-alumina, 0-50 wt % of χ-alumina and/or γ-alumina, 10-70 wt % of molecular sieve, 0-75 wt % of clay, and 0.1-8 wt % of phosphorus, measured as P2O5. The catalyst not only has higher cracking activity and higher cracking ability for cracking heavy oil, but also improves significantly quality and yield of gasoline, LCO and LPG in cracking products.

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1. A catalyst for fluidized catalytic cracking comprising alumina, phosphorous and molecular sieve, wherein said alumina comprises η-alumina, χ-alumina, and γ-alumina, and wherein the catalyst comprises, on the basis of the total amount of the catalyst: 0.5-50 wt % of η-alumina;less than 50 wt % of

1. A catalyst for fluidized catalytic cracking comprising alumina, phosphorous and molecular sieve, wherein said alumina comprises η-alumina, χ-alumina, and γ-alumina, and wherein the catalyst comprises, on the basis of the total amount of the catalyst: 0.5-50 wt % of η-alumina;less than 50 wt % of χ-alumina and γ-alumina;10-70 wt % of molecular sieve, said molecular sieve is one or more selected from the group consisting of large pore zeolites and medium pore zeolites;greater than 0 to 75 wt % of clay;0.1-5.5 wt % of phosphorous, measured as P2O5; and0.1-2 wt % of rare earth metal, measured as oxide, wherein the phosphorous is impregnated in the catalyst. 2. The catalyst according to claim 1, wherein the catalyst comprises, on the basis of the total amount of the catalyst: 5-45 wt % of η-alumina;less than 40 wt % of χ-alumina and γ-alumina;20-50 wt % of molecular sieve, said molecular sieve is one or more selected from the group consisting of large pore zeolites and medium pore zeolites;greater than 0 to 60 wt % of clay;0.5-5.5 wt % of phosphorous, measured as P2O5; and0.2-1.8 wt % of rare earth metal, measured as oxide, wherein the phosphorous is impregnated in the catalyst. 3. The catalyst according to claim 1, wherein said large pore zeolite is one or more selected from the group consisting of faujasite, zeolite-β and mordenite. 4. The catalyst according to claim 3, wherein said large pore zeolite is one or more selected from the group consisting of a zeolite-Y, a zeolite-Y comprising one or more selected from phosphorous, iron and rare earths, an ultrastable zeolite-Y, an ultrastable zeolite-Y comprising one or more selected from phosphorous, iron and rare earths, a zeolite-BY, an zeolite-HY comprising one or more selected from phosphorous, iron and rare earths, and zeolite-β. 5. The catalyst according to claim 1, wherein said medium pore zeolite is one or more selected from the group consisting of a MFI-structured zeolite and a MFI-structured zeolite comprising one or more selected from phosphorous, iron and rare earths. 6. The catalyst according to claim 1, wherein said molecular sieve is one or more selected from the group consisting of a zeolite-Y, a zeolite-Y comprising one or more selected from phosphorous, iron and/or rare earths, an ultrastable zeolite-Y, an ultrastable zeolite-Y comprising one or more selected from phosphorous, iron and rare earths zeolite-HY, a zeolite-HY comprising one or more selected from phosphorous, iron and rare earths, zeolite-β, a MFI-structured zeolite, a MFI-structured zeolite comprising one or more selected from phosphorous, iron and rare earths, and SAPO molecular sieve. 7. The catalyst according to claim 1, wherein said molecular sieve comprises a mixture of a zeolite-Y and the MFI-structured zeolite, and wherein the content of the zeolite-Y is 30-90 wt %, the content of the MFI-structured zeolite is 10-70 wt %, based on the total amount of said zeolite mixture. 8. The catalyst according to claim 7, wherein the content of the zeolite-Y is 40-85wt %, the content of the MFI-structured zeolite is 15-60 wt %, based on the total amount of said zeolite mixture. 9. The catalyst according to claim 7, wherein said zeolite mixture further comprises zeolite-β, and wherein the content of the zeolite-β is greater than 0to 30 wt %, based on the total amount of said zeolite mixture. 10. The catalyst according to claim 9, wherein the content of zeolite-β is greater than 0 to 20 wt %, based on the total amount of said zeolite mixture. 11. The catalyst according to claim 1, wherein said clay is one or more selected from the group consisting of kaolin, halloysite, montmorillonite, kieselguhr, allokite, soapstone, rectorite, sepiolite, attapulgus, hydrotalcite, and bentonite. 12. A process for preparing the catalyst according to claim 1, comprising: drying a slurry comprising a mixture of an aluminum compound able to form η-alumina and an aluminum compound able to form χ-alumina and an aluminum compound able to form γ-alumina, molecular sieve and water, the drying temperature being from room temperature to 200° C.; and adding further a phosphorus compound and a rare earth metal compound, and then calcining the slurry, the calcining temperature being from higher than 200° C. to 750° C.,wherein, after calcination, said aluminum compounds are converted to a mixture comprising η-alumina, χ-alumina and γ-alumina, and wherein the resulting catalyst comprises, on the basis of the total amount of the catalyst:0.5-50 wt % of η-alumina;less than 50 wt % of χ-alumina and γ-alumina;10-70 wt % of molecular sieve;greater than 0 to 75 wt % of clay;0.1-5.5 wt % of phosphorous, measured as P2O5; and0.1-2 wt % of rare earth metal, measured as oxide. 13. The process for preparing the catalyst according to claim 12, comprising: wherein said molecular sieve is a zeolite mixture comprising a zeolite-Y and the MFI-structured zeolite, and wherein the content of the zeolite-Y is 30-90 wt %, the content of the MFI-structured zeolite is 10-70 wt %, based on the total amount of said zeolite mixture. 14. The process according to claim 12, wherein said rare earth metal compound is one or more selected from the group consisting of rare earth chloride and rare earth nitrate. 15. The process according to claim 12, wherein the aluminum compound that is able to form η-alumina is β-aluminum trihydrate, the aluminum compound able to form χ-alumina is α-aluminum trihydrate, and said aluminum compound able to form γ-alumina is bohemite, pseudo-boehmite and/or alumina sol. 16. The process according to claim 12, wherein said phosphorous compound is one or more selected from the group consisting of phosphoric acid, phosphate, phosphorous acid, phosphite, pyrophosphoric acid, pyrophosphate, polyphosphoric acid, polyphosphate, metaphosphoric acid, and metaphosphate. 17. The process according to claim 16, wherein said phosphorous compound is one or more selected from the group consisting of phosphoric acid, ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, phosphorous acid, ammonium phosphite, sodium pyrophosphate, sodium tripolyphosphate and sodium hexametaphosphate. 18. The catalyst of claim 1 wherein said catalyst composition comprising η-alumina , χ-alumina, γ-alumina, large and medium pore molecular zeolites, phosphorous, and rare earth metal, decreases the olefin content of gasoline. 19. The catalyst of claim 1 wherein said phosphorous is present at 0.1-4.5 wt %, measured as P2O5. 20. The catalyst of claim 19 wherein said phosphorous is present at 0.1-3.0 wt %, measured as P2O5. 21. The catalyst of claim 20 wherein said phosphorous is present at 0.1-2.5 wt %, measured as P2O5. 22. The catalyst of claim 21 wherein said phosphorous is present at 0.1-2.0 wt %, measured as P2O5. 23. The catalyst of claim 22 wherein said phosphorous is present at 0.1-1.5 wt %, measured as P2O5. 24. The catalyst of claim 23 wherein said phosphorous is present at 0.1-1.0 wt %, measured as P2O5. 25. A process for preparing the catalyst according to claim 1, comprising: adding a phosphorous compound to a slurry comprising a mixture of an aluminum compound able to form η-alumina and an aluminum compound able to form χ-alumina and an aluminum compound able to form γ-alumina, molecular sieve and water,drying the slurry to which the phosphorous compound has been added, and calcining the slurry that has been dried,wherein, after calcination, said aluminum compounds are converted to a mixture comprising η-alumina, χ-alumina and γ-alumina, and wherein the resulting catalyst comprises, on the basis of the total amount of the catalyst:0.5-50 wt % of η-alumina;less than 50 wt % of χ-alumina and γ-alumina;10-70 wt % of molecular sieve;greater than 0 to 75 wt % of clay;0.1-5.5 wt % of phosphorous, measured as P2O5; and0.1-2 wt % of rare earth metal, measured as oxide. 26. The process of claim 25 wherein the drying temperature is room temperature to 200° C. 27. The process of claim 25 wherein the calcining temperature is from 300° C. to 600° C. 28. The catalyst obtained by the process of claim 12. 29. The catalyst obtained by the process of claim 13. 30. The catalyst obtained by the process of claim 25.