▎ 摘　　要

NOVELTY - Catalyst comprises 20-25 wt.% organic base modified ZSM-48 molecular sieve, 10-15 wt.% organic base modified ZSM-5 molecular sieve, 2-3 wt.% graphene, 16-20 wt.% active metal component, 9-10 wt.% extrusion additive, 5-7 wt.% binder, and alumina (balance amount). USE - The catalyst is useful for isomerization of lubricating oil (claimed) in hydrocracking petroleum refining process. ADVANTAGE - The catalyst: utilizes composite molecular sieve modified by organic base, which can greatly reduce the content of n-alkanes in the product and greatly improves viscosity index; and has excellent hydrogenation ring-opening performance and strong hydroisomerization ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing catalyst, comprising (i) mixing modified ZSM-48 molecular sieve powder with alumina powder, organic alkali, organic alkali modified ZSM-5 molecular sieve powder and graphene powder, then adding extrusion additive and binder, rolling and shaping, and then calcining at 550-650 degrees C for 10-14 hours to obtain catalyst carrier, (ii) impregnating the catalyst support obtained in step (i) with a solution containing two active metal components in equal volumes for 4-6 hours, then drying at 100-120 degrees C for 12-16 hours and calcining at 650-750 degrees C for 10-14 hours to obtain catalyst intermediate, and (iii) impregnating the catalyst intermediate obtained in step (ii) with solution containing other two active metal components in equal volume for 4-6 hours, then drying at 100-120 degrees C for 12-16 hours, and calcining at 650-750 degrees C for 10-14 hours to obtain final product.