Dispersed group VIB metal sulfide catalyst promoted with Group VIII metal
AssigneeChevron Research Company
InventorsJaime Lopez, Eugene A. Pasek
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Abstract
A process for the preparation of a dispersed Group VIB metal sulfide catalyst which is promoted with a Group VIII metal for use in hydrocarbon oil hydroprocessing comprising dissolving a Group VIB metal compound, such as molybdenum oxide or tungsten oxide, with ammonia to form a water soluble compound such as aqueous ammonium molybdate or ammonium tungstate. The aqueous ammonium molybdate or ammonium tungstate is sulfided in a plurality of sulfiding steps at increasing temperatures. A compound containing a Group VIII metal is added to any sulfiding step in preference to the Group VIB metal dissolving step. The catalyst slurry and feed oil can then be passed to a hydroprocessing reactor.
Claims32
A process for preparing a dispersed Group VIB metal sulfide catalyst promoted with a Group VIII metal for hydrocarbon oil hydroprocessing comprising preparing an aqueous solution of an oxygen-containing ammonium salt of a Group VI metal, sulfiding said ammonium salt in a plurality of distinct sulfiding steps at progressively increasing temperatures including relatively low and relatively high temperature sulfiding steps, wherein said relatively low temperature is below about 350.degree. F. and said relatively high temperature is above about 500.degree. F. to convert said oxygen-containing ammonium salt of Group VIB metal to Group VIB metal sulfide, adding a Group VIII metal compound to at least one of said sulfiding steps and performing at least a relatively high temperature sulfiding step in the presence of feed hydrocarbon oil.
A process for preparing a dispersed Group VIB metal sulfide catalyst promoted with a Group VIII metal for hydrocarbon oil hydroprocessing comprising sulfiding an aqueous dispersion of a thiosubstituted ammonium salt of Group VIB metal in the presence of a Group VIII metal compound, wherein said sulfiding occurs in a plurality of distinct sulfiding steps at progressively increasing temperatures including relatively low and relatively high temperature steps, wherein said relatively low temperature is below about 350.degree. F. and said relatively high temperature is above about 500.degree. F.
Dependencies are inferred from the claim text.