Process for improving the activity of used supported silver catalysts
AssigneeHoechst Aktiengesellschaft
InventorsSiegfried Rebsdat, Sigmund Mayer, Josef Alfranseder, Josef Riedl
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Abstract
The activity of supported silver catalysts, which have been used for the direct oxidation of ethylene to ethylene oxide with molecular oxygen or air and to which from 1 to 1,000 parts, per 1 million parts of catalyst, of cesium and/or rubidium have been applied, is improved by washing the catalyst with an inert liquid prior to the application of cesium and/or rubidium.
Claims12
Process to improve the activity of supported silver catalysts which have been used for the direct oxidation of ethylene to ethylene oxide with molecular oxygen or air by applying to the catalyst from 1 to 1,000 parts, per 1 million part of catalyst, of cesium, rubidium or a mixture thereof, which comprises washing the catalyst with an inert organic liquid prior to the application of cesium rubidium or mixture thereof.
Dependencies are inferred from the claim text.