Mineral oils: processes and products – Refining – Nitrogen contaminant removal
Patent
1989-05-10
1991-02-05
Myers, Helane E.
Mineral oils: processes and products
Refining
Nitrogen contaminant removal
208216R, 208251H, 502 66, 502 69, 502257, 502327, C10G 100
Patent
active
049902431
ABSTRACT:
This invention provides a layered catalyst system for hydro-denitrification of hydrocarbons, such as vacuum gas oil, used for hydrocracking to produce various fuels. The layered catalyst system of this invention comprises a first layer of a nickel-molybdenum-phosphorus/alumina catalyst or a cobalt-molybdenum-phosphorus/alumina catalyst and a second layer catalyst comprising a nickel-tungsten/silica-alumina-zeolite or a nickel-molybdenum/silica-alumina-zeolite catalyst. The preferred aspects of the combination of the layered catalysts disclosed herein are: (a) the first layer alumina catalyst has a molybdenum content greater than about 14% by wt.; (b) the first layer alumina catalyst has a relatively large pore size, such as at least about 60 .ANG.; and (c) the second layer catalyst contains at least about 2% of a zeolite component. The layered catalyst system of this invention and the attendant process produces improved denitrification of feedstocks, improved catalyst life and other advantages.
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Sullivan Richard F.
Winslow Philip L.
Chevron Research and Technology Company
Myers Helane E.
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