Process for producing coated catalysts for the synthesis of male

Details Process for producing coated catalysts for the synthesis of male Process for producing coated catalysts for the synthesis of male

1998-06-23

2000-04-11

Dentz, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549259, 549260, C07D30734, B01J 27198

Patent

active

060489871

ABSTRACT:
There is a process for producing coated catalysts for the gas-phase oxidation of C.sub.4 hydrocarbons to maleic anhydride. A vanadyl phosphate catalyst precursor is prepared having a V/P ratio of from 1:0.5 to 1:2 and a mean vanadium oxidation state of from 3.9 to 4.5. The vanadyl phosphate precursor is then calcined by heating for a several hours at a temperature of from 200.degree. C. to 500.degree. C. before being applied, in an aqueous suspension to the support bodies. Furthermore, there is the use of these coated catalysts in processes for the gas-phase oxidation of saturated or unsaturated C.sub.4 -hydrocarbons to maleic anhydride.

REFERENCES:
patent: 3987063 (1976-10-01), Lemal et al.
patent: 4132670 (1979-01-01), Katsumoto et al.
patent: 4336198 (1982-06-01), Dolhyj et al.
patent: 5288880 (1994-02-01), Matsuura
patent: 5496787 (1996-03-01), Hatano et al.
Derwent Abstract corresponding to DE 19645066 (# 98-262308).

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