Ethylenoxidkatalysator und Verfahren zu seiner Herstellung und seiner Anwendung

摘要

This invention relates to an ethylene oxide catalyst having improved selectivity stability which catalyst comprises silver, a promoting amount of alkali metal, a promoting amount of rare earth, a promoting amount of rhenium and, optionally, a promoting amount of rhenium co-promoter selected from sulphur, molybdenum, tungsten, chromium and mixtures thereof, supported on a porous refractory support.