Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1980-05-05
1982-06-08
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252437, 549259, B01J 2322, B01J 2718
Patent
active
043338534
ABSTRACT:
The present invention provides improved oxidation catalysts containing mixed oxides of vanadium and phosphorus and the method for the preparation thereof, 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 excellent yields of maleic anhydride with very good selectivity. At least one vanadium compound, a substantial portion of which is in the pentavalent state, and at least one phosphorus-containing compound is added to an organic liquid medium capable of reducing at least a portion of the vanadium to a +4 valence state, to form a reaction mixture. Partial reduction of the vanadium is effected in the presence of the phosphorus-containing compound and a highly ordered and uniform mixed vanadium phosphorus oxide-containing catalyst precursor is formed.
REFERENCES:
patent: 3864280 (1975-02-01), Schneider
patent: 3985775 (1976-10-01), Harrison
patent: 4016105 (1977-04-01), Kerr
patent: 4043943 (1977-08-01), Schneider
patent: 4132670 (1979-01-01), Katsumoto et al.
patent: 4149992 (1979-04-01), Mount et al.
Bremer Noel J.
Dria Dennis E.
Milberger Ernest C.
Curatolo Joseph G.
Evans Larry W.
Knudsen Herbert D.
Shine W. J.
The Standard Oil Company
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