Silver catalyst

摘要

A silver catalyst containing one or more alkali metals and also tungsten as promotors for the direct oxidation of ethylene with oxygen to form ethylene oxide, on a porous support substantially consisting of alpha -aluminum oxide and having a specific surface area (BET) of from 0.3 to 3 m2/g, which contains tungsten in a concentration of from 60 to 330 ppmwt, based on the total catalyst, per m2 of surface area for each gram of supporting material.