Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1975-07-24
1977-03-22
Garvin, Patrick P.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252435, 2603468R, B01J 2718, B01J 3700
Patent
active
040135861
ABSTRACT:
An improved process was found for preparing a vanadium-containing catalyst wherein a tetravalent vanadium compound is provided from a pentavalent vanadium compound, comprising contacting the pentavalent vanadium compound with a phosphonate. The improved process is exemplified by the preparation of phosphorus-vanadium-oxygen catalysts, and particularly the preparation of phosphorus-vanadium-oxygen catalysts having a phosphorus to vanadium atom ratio of about 1:2 to about 2:1 comprising contacting a vanadium compound with a selected phosphonate, recovering a phosphorus-vanadium-oxygen precursor, and thereafter calcining the precursor to form the catalysts. The compound 1-hydroxy-1,1-ethylidene diphosphonic acid is preferred as the phosphonate.
REFERENCES:
patent: 2773921 (1956-12-01), Rylander et al.
patent: 3031508 (1962-04-01), Etherington et al.
patent: 3156707 (1964-11-01), Kerr
patent: 3474041 (1969-10-01), Kerr
patent: 3845094 (1974-10-01), Angstadt
patent: 3907707 (1975-09-01), Raffelson et al.
Dolan Thomas J.
Mitchell Robert S.
Garvin Patrick P.
Monsanto Company
Roberts H. B.
Shearin F. D.
Willis N. E.
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