LAMINAR CATALYST SYSTEM AND HYDROCARBON DENITROFICATION METHOD Russian patent published in 1997 - IPC

FIELD: preparation of catalysts for petrochemical processes. SUBSTANCE: invention deals with catalysts for hydrodenitration of hydrocarbon systems, for example, vacuum gas oil, applied in hydrocracking process to produce various-type fuels. According to invention, laminar catalyst system contains first catalyst layer based on nickel-molybdenum-phosphorus/alumina or cobalt-molybdenum- phosphorus/alumina and the second catalyst layer constituting nickel- tungsten/silica-alumina-zeolite or nickel-molybdenum/silica-alumina- zeolite catalyst. Preferred features consist in the following: (i) molybdenum content in the first-layer alumina-based catalyst is higher than about 14 wt %; (ii) first-layer alumina-based catalyst has relatively large pore size, e.g. at least some 60 ; and (iii) second-layer catalyst has about 2% of zeolite component. EFFECT: increased catalytic activity and service life of catalyst. 10 cl, 5 tbl