| 摘要 |
This invention relates to a process for the preparation of an ethylene oxide catalyst having improved selectivity stability which process comprises depositing a promoting amount of a Group I element selected from the group consisting of potassium, lithium and mixtures thereof, on a porous, refractory support, at least partially drying the support, thereafter depositing a catalytically effective amount of silver, a promoting amount of alkali metal, a promoting amount of rhenium and optionally, a promoting amount of a rhenium co-promoter selected from sulphur, molybdenum, tungsten, chromium, phosphorus, boron and mixtures thereof, on the support, and subsequently drying the support. |
