Preparation of vanadium phosphorus catalysts using a mixed...

Details Preparation of vanadium phosphorus catalysts using a mixed... Preparation of vanadium phosphorus catalysts using a mixed...

B - Operations, Transporting

01

J

252/98, 260/365.

B01J 27/14 (2006.01) B01J 23/22 (2006.01) B01J 27/198 (2006.01) C07C 51/215 (2006.01) C07C 51/25 (2006.01) C07D 307/60 (2006.01)

Patent

CA 1178264

ABSTRACT The present invention provides a process for the preparation of oxidation catalysts containing mixed oxides of vanadium and phosphorus, which catalysts are particularly effective in the oxidation of n-butane, n-butanes, 1.3-butadiene of a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce high yields of maleic anhydride with good selectivity. A vanadium compound is introduced into a liquid medium, a mixed phosphorus component comprising orthophosphoric acid and pyrophosphoric acid is added to the liquid medium, reduction of at least a portion of the vanadium to a +4 valence state is effected either prior to or subsequent to the addition of the mixed phosphorus component, and the resulting vanadium-phosphorus oxide catalyst precursor is recovered, dried and calcined.

389300

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