Hydrocracking catalysts containing stabilized aggregates of small crystallites of zeolite Y associated hydrocarbon conversion processes

摘要

This invention relates to hydrocracking catalysts utilizing stabilized aggregates of small primary crystallites of zeolite Y that are clustered into larger secondary particles. At least 80% of the secondary particles may comprise at least 5 primary crystallites. The size of the primary crystallites may be at most about 0.5 micron, or at most about 0.3 micron, and the size of the secondary particles may be at least about 0.8 micron, or at least about 1.0 μm. The silica to alumina ratio of the resulting stabilized aggregated Y zeolite may be 4:1 or more. This invention also relates to the use of such catalysts in hydrocracking processes for the conversion of heavy oils into lighter fuel products. The invention is particularly suited for the selective production of diesel range products from gas oil range feedstock materials under hydrocracking conditions.

主权项

1. A hydrocracking catalyst for improved diesel production, wherein the catalyst comprises:
a) an aggregated form of zeolite Y comprising small size primary crystallites of zeolite Y, wherein at least a portion of the primary crystallites are aggregated to form larger secondary particles, wherein the aggregated zeolite Y has a silica-to-alumina ratio of at least 4:1, and an alkali metal content of less than 4 wt % based on the zeolite; and b) a binder; wherein the hydrocracking catalyst has an Alpha value of less than 15, and an External Surface Area-to-Total Surface Area ratio of at least 0.35:1.