PROTECTIVE-LAYER CATALYST FOR HYDROFINING OF PETROLEUM FRACTIONS Russian patent published in 2008 - IPC B01J23/88 B01J23/883 

FIELD: petroleum processing.

SUBSTANCE: invention relates to preparation of protective-layer catalysts for hydrofining of petroleum fractions in petroleum processing industry. Invention provides catalyst containing oxides of molybdenum, nickel and/or cobalt, silicon, and aluminum, which catalyst is molded in the form of hollow cylindrical granules. Starting composition for preparation of alumina-based carrier includes structuring additive, 5.0-8.5%, kaolin, 2.0-5.0%, and alumino-nickel-molybdenum and/or alumino-cobalt-molybdenum catalyst, 10-20%. Thus prepared alumina-supported contains 0.5-4.0% nickel oxide and/or cobalt oxide and 0.8-3.0% silicon oxide.

EFFECT: increased degree of hydrogenation of unsaturated hydrocarbons, prevented coking of basic catalyst, and reduced pressure gradient.

3 cl, 4 ex