Catalysts for preparation of aromatic carboxylic anhydrides

Details Catalysts for preparation of aromatic carboxylic anhydrides Catalysts for preparation of aromatic carboxylic anhydrides

C - Chemistry, Metallurgy

07

D

260/364.8

C07D 307/89 (2006.01) B01J 23/22 (2006.01) C07C 51/215 (2006.01) C07C 51/25 (2006.01) C07C 51/265 (2006.01) C07C 51/31 (2006.01)

Patent

CA 1267654

ABSTRACT OF THE DISCLOSURE In accordance with the process of this inven- tion, 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 continuous monolayer amount of at least one source of zirconium dioxide, calcining the thus-formed catalyst precursor under conditions suf- ficient to convert the zirconium oxide source into the oxide form, depositing upon the calcined catalyst pre- cursor 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.

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