Method of making catalysts for the production of ethylene oxide

Details Method of making catalysts for the production of ethylene oxide Method of making catalysts for the production of ethylene oxide

1979-05-29

1981-02-03

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

26034834, B01J 2104, B01J 2302, B01J 2350

Patent

active

042487412

ABSTRACT:
An improved process for preparing a silver catalyst which comprises impregnating a porous alumina support with a silver salt, preferably silver nitrate, by contacting a quantity of the support with an aqueous solution of the salt in sufficient amount to be completely absorbed by said support while under a vacuum. A dispersing agent is also employed in the aqueous silver salt solution. The support is dried by heating, e.g. 100.degree. C., under vacuum and then, while still under vacuum, impregnated with a reducing agent employing an amount sufficient to be completely absorbed by the support. Subsequent heating at a higher temperature, e.g. 250.degree. C., reduces the silver salt to silver metal. A catalyst is produced which, when employed for the oxidation of ethylene, permits the process to run 5.degree.-10.degree. C. cooler at the normal conversion and also gives an improved yield.

REFERENCES:
patent: 3423328 (1969-01-01), Keith et al.
patent: 3575888 (1971-04-01), Long
patent: 3702259 (1972-11-01), Nielsen
patent: 3887491 (1975-06-01), Ramirez et al.
patent: 4039561 (1977-08-01), Mitsuhata et al.
patent: 4102820 (1978-07-01), Cavitt
patent: 4123385 (1978-10-01), Rebsdat et al.

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