Y CATALYTIC CRACKING CATALYST CONTAINING MODIFIED Y TYPE MOLECULAR SIEVE AND PREPARATION METHOD THEREFOR

摘要

The present invention discloses catalytic cracking catalysts and methods for their preparation. The catalytic cracking catalyst comprises a cracking active ingredient, 10 to 70% by weight of clay and 10 to 40% by weight of an inorganic oxide binder, based on the dry weight, wherein the cracking active ingredient is dry weight to the weight of the catalytic cracking catalyst. 10 to 50 weight percent modified Y-type molecular sieve on a basis of 0 to 40 weight percent of other molecular sieves on a dry weight basis, wherein the modified Y-type molecular sieve is a unit cell of 2.420 nm to 2.440 nm size; As weight percent of the modified Y-type molecular sieve, the content of P is 0.05% to 6%, the content of RE ₂ O ₃ is 0.03% to 10%, and the content of alumina is less than 22%; Specific hydroxy nest concentration is greater than 0.05 mmol / g and less than 0.35 mmol / g.