Patent ID: 6022471
Filing Date: 2000-02-08
Classification: B01J,C10G

Abstract:
A catalytic cracking catalyst having improved selectivity for conversion over coke formation which comprises:(a) from 1 to 80 wt. %, based on catalyst composition, of a crystalline aluminosilicate zeolite having a silica to alumina mole ratio of about 1 or greater;(b) from 5 to 50 wt. %, based on catalyst composition, of an aluminum trihydroxide consisting essentially of gibbsite;(c) from 0.5 to 20 wt. %, based on catalyst composition, of at least one rare earth metal compound; and(d) a silica matrix, wherein the silica matrix is prepared from at least one of (i) a silica sol made by an ion-exchange process, and (ii) an acidic silica sol prepared by mixing sodium silicate, an acid, and an aluminum salt of a mineral acid provided that the sol is not converted to a gel during catalyst preparation.