Vanadotungstomolybdophosphoric acid oxidation catalyst

Details Vanadotungstomolybdophosphoric acid oxidation catalyst Vanadotungstomolybdophosphoric acid oxidation catalyst

1983-02-22

1985-06-11

Wright, William G.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Phosphorus or compound containing same

502210, 502211, 562599, B01J 2714, C07B 300

Patent

active

045229341

ABSTRACT:
A novel synthetic procedure is disclosed for producing heteropolyacid catalysts having the general formula H.sub.3+x PV.sub.x W.sub.3-x Mo.sub.9 O.sub.40 where 0<x<3. The synthesis of these catalysts requires the formation of a defect structure wherein three of the twelve transition metals which surround the phosphorus hetero atom are missing. Three metal atoms of two other transition metals are then added to the cluster in a separate step by mixing Na.sub.3 H.sub.6 PMo.sub.9 O.sub.34 with the oxides of such transition metals in the presence of hydrochloric acid. A preferred catalyst having the formula H.sub.3.5 PV.sub.0.5 W.sub.2.5 Mo.sub.9 O.sub.40 is also described.

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patent: 4273676 (1981-06-01), Motsumoto et al.
patent: 4320227 (1982-03-01), Motsumoto et al.
patent: 4335018 (1982-06-01), Franz et al.
PNMR, Studies on Molybdic and Tungstic Heteropolyanions Massart et al., Mar. 3, 1977, Inorganic Chemistry.

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