Mesoporous FCC catalyst formulated with gibbsite and rare earth oxide
AssigneeExxon Research & Engineering Co.
InventorsWilliam A. Wachter, Vinh T. Nguyen
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Abstract
A FCC catalyst having improved coke selectivity and a FCC process for converting hydrocarbon feedstocks to lower boiling products. The catalyst comprises a crystalline aluminosilicate zeolite, gibbsite, rare earth metal compound and a silica matrix prepared from at least one of a silica sol made by an ion-exchange process and an acidic silica sol prepared by mixing sodium silicate, an acid and an aluminum salt of an acid.
Claims18
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.
A fluid catalytic cracking process for converting a hydrocarbon feedstock into lower boiling products which comprises contacting the feedstock with a fluidized bed of catalytic cracking catalyst having improved selectivity for conversion over coke formation under catalytic cracking conditions wherein the catalytic cracking catalyst 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.
Dependencies are inferred from the claim text.