초록 ▼

A layered hydrocracking catalyst system has high middle distillate selectivity when used for hydrocracking a high sulfur and high nitrogen containing feedstock. The layered system comprises a first layer catalyst with contains a zeolite having a unit cell size of greater than about 24.35 Angstroms,

A layered hydrocracking catalyst system has high middle distillate selectivity when used for hydrocracking a high sulfur and high nitrogen containing feedstock. The layered system comprises a first layer catalyst with contains a zeolite having a unit cell size of greater than about 24.35 Angstroms, and a second layer catalyst which contains a zeolite having a unit cell size of less than about 24.30 Angstroms. The layered system is particularly beneficial in terms of catalyst life and product selectivity for reactors operated under conditions of a high temperature profile.

대표청구항 ▼

[ What is claimed is:] [1.] A hydrocracking process comprising contacting a petroleum feedstock and hydrogen at hydrocracking conditions with a first catalyst layer which contains catalyst particles comprising a Y-type zeolite having a unit cell size of greater than about 24.35 Angstroms and contact

[ What is claimed is:] [1.] A hydrocracking process comprising contacting a petroleum feedstock and hydrogen at hydrocracking conditions with a first catalyst layer which contains catalyst particles comprising a Y-type zeolite having a unit cell size of greater than about 24.35 Angstroms and contacting the entire effluent from the first catalyst layer at hydrocracking conditions with a second catalyst layer which contains catalyst particles comprising a Y-type zeolite having a unit cell size of less than about 24.30 Angstroms.