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US 4,791,092 AGranted
Aromatic carboxylic anhydride catalyst
AssigneeExxon Research & Engineering Co.
InventorsIsrael E. Wachs, Ramzi Y. Saleh, Claudio C. Chersich
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AssigneeExxon Research & Engineering Co.
InventorsIsrael E. Wachs, Ramzi Y. Saleh, Claudio C. Chersich
Estimating the term…
In accordance with the process of this invention, an improved catalyst for molecular oxidation of an aromatic hydrocarbon to form the corresponding aromatc carboxylic anhydrides is prepared by the steps of forming a catalyst precursor by depositing on titanium dioxide solids in the anatase form a discontinuous monolayer amount of at least one source of tantalum oxide, calcining the thus-formed catalyst precursor under conditions sufficient to convert the tantalum oxide source into the oxide form, depositing upon the calcined catalyst precursor a catalytically effective amount of at least one vanadium compound which is convertible into vanadium oxide upon heating and calcining the vanadium-deposited solids under conditions sufficient to convert the vanadium compound into vanadium oxide.
A process for preparing a catalyst composition comprising vanadium, tantalum and oxygen capable of catalyzing the oxidation of hydrocarbons which comprises:
Improved catalyst which comprises from about 0.001 to 1 weight percent tantalum oxide, from about 0.7 to 50 weight percent vanadium oxide and from about 49 to 99.3 weight percent titanium dioxide anatase, and wherein said vanadium oxide is present in an amount of at least 1.7 N.sub.min grams wherein
Improved catalyst consisting essentially of from about 0.001 to 1 weight percent tantalum oxide, from about 0.7 to 50 weight percent vanadium oxide and from about 49 to 99.3 weight percent titanium dioxide anatase, and wherein said vanadium oxide is present in an amount of at least 1.7 N.sub.min grams wherein
Dependencies are inferred from the claim text.