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US 4,402,865 AGranted
Method for comulling metals without crystal formation
AssigneeChevron Research Company
InventorDonald W. Blakely, deceased
Life of this patent
Estimating the term…
Abstract
Crystal formation of CoMoO.sub.4 and NiMoO.sub.4 is prevented in hydroprocessing catalysts containing both cobalt or nickel and molybdenum. The metals are comulled with the support material in the presence of a polyprotic acid.
Claims5
A method for the preparation of molybdenum-containing hydroprocessing catalysts comprising:
- (a) peptizing a prewashed refractory inorganic base in the presence of a polyprotic acid while mulling;
- (b) adding a Group VIII metal compound while mulling;
- (c) neutralizing the polyprotic acid;
- (d) adding a molybdenum compound while mulling;
- (e) shaping, drying, and calcining catalyst particles from said comulled refractory inorganic oxide catalyst base, said catalyst particles characterized by the substantial absence of crystals of Group VIII metal compounds containing MoO.sub.4.sup..dbd. ions.
2 more elements
Dependencies are inferred from the claim text.