Claims
- 1. In a process for the preparation of a supported silver catalyst suitable for use in the oxidation of ethylene to ethylene oxide wherein an inert support is impregnated with a silver/amine solution and with one or more alkali metal selected from potassium, rubidium and cesium and calcined, the improvement which comprises heating the impregnated support to 300.degree.-500.degree. C. for a time sufficient to convert the silver to metallic silver and to decompose and remove organic materials, the impregnated support being maintained under an inert gas atmosphere essentially free of oxygen at temperatures of 250.degree. C. or higher.
- 2. The process of claim 1 wherein the impregnated support is maintained under an inert gas atmosphere essentially free of oxygen at temperatures of 100.degree. C. or higher.
- 3. The process of claim 1 wherein the inert gas is nitrogen.
- 4. The process of claim 1 wherein the alkali metal is cesium.
- 5. The process of claim 1 wherein the support is impregnated with a promoter combination comprised of cesium and tungsten, molybdenum and/or chromium.
- 6. The process of claim 5 wherein the promoter combination also comprises sulfur and/or fluorine.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 08/348,340 filed Dec. 2, 1994, now U.S. Pat. No. 5,504,052.
US Referenced Citations (10)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
348340 |
Dec 1994 |
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