| abstract |
A process for the preparation of a silver-containing catalyst suitable for the oxidation of ethylene to ethylene oxide which comprises:n a) mixing alumina with a tin compound and with an alkali metal compound, b) calcining the mixture to obtain an alkali metal-enriched and tin-modified alumina carrier, c) impregnating the carrier with a solution of a silver compound, which is sufficient to cause precipitation on the carrier of from 1 to 25 per cent by weight, on the total catalyst, of silver and before, during or after that impregnation also impregnating the carrier with one or more dissolved alkali metal compounds and with a rhenium compound as promoters, d) precipitating the silver compound on the carrier and e) reducing the silver compound to metallic silver. |