| 摘要 |
An improved silver catalyst for the oxidation of ethylene with molecular oxygen is made by impregnating a porous support with a silver salt of an acid; subjecting the impregnated support to a multi-stage activation in an atmosphere containing less oxygen than air by heating at a first temperature in the range of 150 to 200° C. for less than an hour, heating at a second temperature in the range of from greater than 200° C. to 300° C. for less than one hour, heating at a third temperature in the range of from greater than 300° C. to 400° C. for less than one hour and finally heating at a fourth temperature in the range of from greater than 400° C. to 500° C.; and post impregnating the support with an alkali metal, preferably cesium, from an anhydrous alcohol solution followed by washing with alcohol solvent and rapid drying to produce a finished catalyst having from 1-6x10-3 gew of the alkali metal per kg of catalyst. |
