Aromatic carboxylic anhydride catalysts

C - Chemistry – Metallurgy – 07 – D

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252/98, 260/365.

C07D 307/89 (2006.01) B01J 23/20 (2006.01) B01J 23/22 (2006.01) B01J 37/02 (2006.01) C07C 51/265 (2006.01) C07D 493/04 (2006.01)

Patent

CA 1250278

Abstract of the Disclosure In accordance with the process of this in- vention, an improved catalyst for molecular oxidation of an aromatic hydrocarbon to form the corresponding aromatic carboxylic anhydrides is prepared by the steps of forming a catalyst precursor by depositing on titanium dioxide solids in the anatase form a discon tinuous 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 con- ditions sufficient to convert the vanadium compound into vanadium oxide.

483228

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