Process for preparing silver catalysts

Details Process for preparing silver catalysts Process for preparing silver catalysts

1987-01-30

1989-09-05

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30110

Patent

active

048640425

ABSTRACT:
A supported silver catalyst for the oxidation of ethylene to ethylene oxide with molecular oxygen is made by impregnating a support with a hydrocarbon solution of a silver salt of a neo-acid having 7 or more carbon atoms, substantially free of water and said neo-acid. Preferably, the hydrocarbon solvent is toluene, xylene, ethyl benzene, cyclohexane, or cumene. The impregnated support is dried and the silver is activated under conditions chosen to provide the optimum selectivity to ethylene oxide. Thereafter, the activated silver catalyst maybe impregnated with an alkali metal solution sufficient to increase selectivity of the silver catalyst above its alkali-free state. The amount of alkali metal on the finished catalyst is the optimum for the particular support selected and preferably will be about 1-6.times.10.sup.-3 gew/kg of catalyst. The catalyst may also include additional promoters, such as the alkaline earth metals, preferbly barium.

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patent: 4455392 (1984-06-01), Warner et al.
F. L. W. McKim and A. Cambron, Can J. of Research, "The Catalytic Oxidation of Ethylene to Ethylene Oxide," 27, Sec. B, (11), pp. 814-827, (1949).

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