CRACKING CATALYST AND PREPARATION METHOD THEREOF

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FIELD : chemistry. SUBSTANCE : cracking catalysts contains aluminium oxide, phosphorus and molecular sieves with clay or without clay whereat said aluminium oxide is η-aluminium oxide or mixture of η-aluminium oxide and χ-aluminium oxide and/or γ-aluminium oxide with general composition per all catalyst, wt : % η-aluminium oxide 0.5-50; χ-aluminium oxide and/or γ-aluminium oxide 0-50; molecular sieves 10-70; clay 0-75; and phosphorus in the form of P2O5 0.1-8. The method for catalysts preparation includes : drying of the suspension containing aluminium compound, molecular sieves and water with clay or without clay and calcination of the said suspension with following adding of phosphorus compound. The said aluminium compound is aluminium compound able to form η-aluminium oxide or mixture of the aluminium compound able to form η-aluminium oxide with compound able to form χ-aluminium oxide and/or γ-aluminium oxide with every component using in such amount that resulting catalyst agrees aforementioned composition. The methods for catalysts preparation are described also providing additional inlet of rare earth metal or usage in the quality of molecular sieves of the zeolites mixture containing zeolite Y and zeolite with structure MFI whereat content of zeolite Y is 30-90% wt and content of zeolite with structure MFI is 10-70% wt per total amount of zeolites mixture. EFFECT : increase of catalyst activity and quality enhancing of the petrol containing in the cracking products. 23 cl, 26 tbl, 52 ex