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US 4,359,405 AGranted
Solvent conditioning of phosphorus-vanadium-oxygen catalysts
AssigneeMonsanto Company
InventorsRamon A. Mount, Warn D. Robinson
Life of this patent
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Abstract
In the preparation of phosphorus-vanadium-oxygen catalyst, where vanadium and phosphorus are contacted under conditions to provide a catalyst precursor with vanadium in the tetravalent state, and the precursor is formed into agglomerations and subsequently calcined at high temperatures, the improvement which comprises contacting the catalyst precursor with a non-aqueous solvent in an amount sufficient to enhance crush strength.
Claims31
In a process for preparing phosphorus-vanadium-oxygen complex catalysts having a phosphorus to vanadium atom ratio in the range of about 1:2 to about 2:1, the process comprising:
- (a) contacting vanadium and phosphorus compounds under conditions which will provide a catalyst precursor wherein greater than 50 atom % of the vanadium is in the tetravalent state;
- (b) recovering the catalyst precursor in a dry condition;
- (c) forming the catalyst precursor into agglomerates;
- and
- (d) calcining the catalyst precursor agglomerations at a temperature between about 300.degree. C. and 600.degree. C.,
- the improvement comprising contacting the recovered dry catalyst precursor with a non-aqueous solvent in an amount sufficient to increase crush strength and then drying the catalyst precursor.
3 more elements
Dependencies are inferred from the claim text.