| 摘要 |
A catalyst composition is provided comprising reduced silver combined with at least one carbonate of a rare earth metal and yttrium, at least one salt of an alkali or alkaline earth metal, and a catalyst carrier, wherein the carbonate is prepared by the reaction of a chloride of a rare earth metal or yttrium with an alkali carbonate or bicarbonate. The catalyst shows high selectivity in the oxidation of ethylene to ethylene oxide in the presence of the catalyst and molecular oxygen. |
