Process for improving the activity of used supported silver cata

Details Process for improving the activity of used supported silver cata Process for improving the activity of used supported silver cata

1977-08-09

1978-10-31

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252412, 252463, 252477R, 26034834, 422211, B01J 2396, B01J 2350, C07D30110, C07D30304

Patent

active

041233859

ABSTRACT:
The activity of supported silver catalysts used up in the direct oxidation of ethylene with molecular oxygen or air is improved by impregnating the catalyst arranged in a fixed bed with a solution of a caesium and/or rubidium compound in an inert organic solvent, optionally together with up to 40% by weight of water, calculated on the total liquid, as dissolving intermediary, so as to produce a concentration gradient of from 0.3 to 20 parts of caesium and/or rubidium per 1 million parts of catalyst and per meter of fixed bed, counter to the direction of flow of the gas to be reacted. In this manner the activity of the catalyst is considerably improved which results in an increased selectivity of the oxidation of ethylene to ethylene oxide.

REFERENCES:
patent: 2831870 (1958-04-01), McClements
patent: 3121099 (1964-02-01), Endler
patent: 4051068 (1977-09-01), Rebsdat et al.

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