SILVER CATALYST FOR PRODUCTION OF ETHYLENE OXIDE FROM ETHYLENE, AND PROCESS FOR PRODUCTION THEREOF

摘要

A catalyst for the production of ethylene oxide from ethylene, said catalyst comprising a porous carrier composed of a molded article of a refractory material and at least silver grains deposited on the carrier, wherein (A) silver is distributed on the outside surface of the carrier and on the inner surfaces of the pores of the carrier, (B) silver grains distributed on the inner surfaces of the pores of the carrier have an average diameter of 0.05 to 0.4 micron, and (C) the loading (S) of silver on the outside surface layer of the catalyst and the loading (I) of silver on the innermost layer of the catalyst satisfy the following expression I>/=0.65S; and a process for producing a catalyst for the production of ethylene oxide from ethylene, which comprises impregnating an aqueous solution containing a silver salt and an amine as a complex forming agent in a porous carrier composed of a molded article of a refractory material, and heating the carrier with superheated steam to deposit silver on the carrier.