Process for improving the activity of supported silver catalysts

Details Process for improving the activity of supported silver catalysts Process for improving the activity of supported silver catalysts

1980-09-17

1982-06-15

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252414, 252476, 549534, 549538, B01J 2396, B01J 2348

Patent

active

043350143

ABSTRACT:
Supported silver catalysts, which should have as high an activity as possible, are employed for the manufacture of ethylene oxide by oxidizing ethylene by means of oxygen or air. A process is described for improving the activity of supported silver catalysts which have already been used, in which the used catalyst is first washed with an inert liquid containing ammonia and/or aliphatic amines and 1 to 1,000 parts, per 1 million parts of catalyst, of cesium, rubidium or a mixture thereof is then deposited on the washed catalyst. The deposition is generally effected with the aid of an impregnating solution containing the cesium and/or rubidium compounds in a suitable quantity. This process makes it possible to improve considerably the activity of supported silver catalysts which have already been in use for the oxidation of ethylene by means of oxygen or air.

REFERENCES:
patent: 4123385 (1978-10-01), Rebsdat et al.
patent: 4125480 (1978-11-01), Maxwell
patent: 4278562 (1981-07-01), Mross et al.

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