Stable molybdenum catalysts for high conversion of C.sup.3 and C

Details Stable molybdenum catalysts for high conversion of C.sup.3 and C Stable molybdenum catalysts for high conversion of C.sup.3 and C

1980-03-24

1981-06-09

Gantz, Delbert E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252435, 252438, 252439, 252441, B01J 2714, B01J 2724, B01J 2702, B01J 2706

Patent

active

042724082

ABSTRACT:
A stabilized heteropoly molybdate catalyst precursor in calcined form and containing anionic molybdenum in defect state is surface impregnated with certain metal cations. The stabilized precursor is one obtained by incorporating into the reaction product of a molybdate and a soluble phosphate, silicate or arsenate, an aqueous chloride ion and a compound of phosphotungstate, silicotungstate, vanadium arsenate, silico-arsenate, phosphovanadate, or silicovanadate, followed by drying and calcining. During the chloride ion stabilization step other metals may be optionally incorporated in forming the stabilized precursor.
The obtained precursor is catalytically active in the conversion of the unsaturated aldehydes to the corresponding unsaturated carboxylic acids with or without incorporation of the metal cation during the chloride ion stabilization step. When the obtained calcined precursor is surface impregnated with a Group VIII metal cation, preferably cobalt and/or iron, and with a compound of selenium or tellurium, the resulting catalysts are highly active and are capable of direct conversion of C.sub.3 -C.sub.4 monoolefins in a single step to the corresponding unsaturated carboxylic acids.

REFERENCES:
patent: 4212767 (1980-07-01), Daniel

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