Silberkatalysator zur Herstellung von Ethylenoxid , Verfahren zu seiner Herstellung und Verfahren zur Herstellung von Ethylenoxid

摘要

A silver catalyst excelling in catalytic performance and permitting production of ethylene oxide with a high selectivity for a long time, a method for the production of ethylene oxide by the use of the silver catalyst, and a method for ideal manufacture of the silver catalyst are disclosed. The silver catalyst is formed by depositing silver on a carrier having alpha -alumina as a main component and used for the production of ethylene oxide, which carrier of the silver catalyst has undergone the following treatment capable of yielding a wash exhibiting a resistivity index of not less than 10,000 OMEGA .cm (25 DEG C): (Method of treatment> In a conical beaker having an inner volume of 500 ml, 300 ml of the carrier is placed, dried therein at 120 DEG C for two hours, and boiled in conjunction with (water absorption + 220) ml of pure water added thereto under normal pressure at 90 DEG C for 30 minutes, providing that the term "water absorption" as used herein refers to what is expressed by the following formula (1): $O$