Preparation of vanadium phosphorus catalysts

Details Preparation of vanadium phosphorus catalysts Preparation of vanadium phosphorus catalysts

B - Operations, Transporting

01

J

252/98, 260/365.

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 1141742

(5205) IMPROVED PREPARATION OF VANADIUM PHOSPHORUS CATALYSTS ABSTRACT The present invention provides a method 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-butenes, 1,3- butadiene or a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce improved yields of maleic anhydride with good selectivity. A vanadium compound is at least partially solubilized in an organic liquid medium capable of reducing at least a portion of the vanadium to a +4 valence state, and unsolubilized vanadium having a particle size larger than about 0.1 mm diameter is removed from the medium before addition of a phosphorus- containing compound.

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