Preparation of vanadium phosphorus catalysts
AssigneeThe Standard Oil Company
InventorsMichael F. Lemanski, Gregory G. Spitnale, Ernest C. Milberger
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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 high yields of maleic anhydride with good selectivity. Vanadium phosphorus mixed oxide catalyst precursors prepared in solution in organic media are extracted from the organic media with water, with subsequent drying down to recover a precursor solid, or impregnation of a support with the aqueous solution.
Claims13
In a process for the preparation of oxidation catalysts containing the mixed oxides of vanadium and phosphorus, the improvement wherein a solubilized vanadium phosphorus oxide catalyst precursor is prepared in an organic liquid medium, including the step of extracting the solubilized catalyst precursor from the organic liquid with water to form a solubilized catalyst precursor-containing aqueous solution.
A process for the preparation of oxidation catalysts containing the mixed oxides of vanadium and phosphorus which comprises:
- (a) preparing a solubilized vanadium phosphorus mixed oxide catalyst precursor containing organic solution;
- (b) contacting said organic solution with water;
- (c) separating the resultant aqueous precursor containing phase from the organic phase;
- (d) drying the catalyst precursor;
- (e) calcining the catalyst precursor.
Dependencies are inferred from the claim text.