Catalyst for the oxidation of methanol to formaldehyde and proce

Details Catalyst for the oxidation of methanol to formaldehyde and proce Catalyst for the oxidation of methanol to formaldehyde and proce

1976-03-05

1977-05-17

Shine, W. J.

Compositions

X-ray or neutron shield

260603HF, B01J 2388

Patent

active

040240746

ABSTRACT:
A catalyst active and selective in the oxidation of methanol to formaldehyde is prepared by mixing an aqueous molybdate solution with an aqueous solution of a ferric salt, while maintaining a Mo/Fe atomic ratio of from 1.6:1 to 2.2:1 in the mixture, heating the resulting suspension at 70.degree.-100.degree. C for at least 30 minutes, washing the resulting precipitate with water, drying said precipitate to reduce its water content to 2-8% by weight, reducing the dried precipitate to granules and drying the latter to completely remove water, impregnating the dried granules with an aqueous solution of a decomposable bismuth salt and drying and calcining the impregnated granules. The catalyst consists of granules of crystalline iron molybdate and molybdenum trioxide having on their surface an interaction product thereof with bismuth oxide, said molybdenum trioxide and said bismuth being present in an amount of 5-35 wt.% and 0.5-10 wt.%, respectively, with respect to the crystalline iron molybdate.

REFERENCES:
patent: 2812309 (1957-11-01), Allyn et al.
patent: 3716497 (1973-02-01), Courty

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