Catalyst for production of ethylene oxide and process for producing the catalyst
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsTomoatsu Iwakura, Yukako Kawakatsu
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Abstract
A catalyst for the production of ethylene oxide which contains silver, tungsten, cesium and, in some cases, an alkaline metal other than cesium, an alkaline-earth metal, a rare-earth metal, and/or metal selected from Groups I B, II B, III B, IV A, IV B, V A, V B and VI A of the Periodic Table and tellurium. The use of the catalyst of this invention provides high selectivity in the production of ethylene oxide by the vapor contact oxidation of ethylene.
Claims20
A catalyst for the production of ethylene oxide from ethylene, said catalyst comprising a porous carrier and at least silver, tungsten and cesium deposited on said carrier, wherein:
- (A) loadings of silver, tungsten and cesium are from 5 to 50% by weight, from 5 to 700 ppm, and from 250 to 2000 ppm, respectively;
- (B) the silver is deposited on the outside surface or said carrier and on the inner surfaces of the pores of said carrier;
- (C) silver grains deposited on said carrier have an average diameter in the range of from 0.01 to 0.4 micron;
- (D) the loading (S.sub.A) of silver on the outside surface layer of said catalyst and the loading (I.sub.A) of silver on the innermost layer of said catalyst satisfy the following formula;
- I.sub.A .gtoreq.0.65S.sub.A
- (E) the tungsten is deposited on the outside surface of said carrier and on the inner surfaces of the pores of said carrier, and the loading (S.sub.W) of tungsten on the outside surface layer of said catalyst and the loading (I.sub.W) of tungsten on the innermost layer of said catalyst satisfy the following formula;
- I.sub.W .gtoreq.0.5S.sub.W
- and
- (F) the cesium is deposited on the outside surface of said carrier and on the inner surfaces of the pores of said carrier, and the loading (S.sub.C) of cesium on the outside surface layer of said catalyst and the loading (I.sub.C) of tungsten on the innermost layer of said catalyst satisfy the following formula:
- I.sub.C .gtoreq.0.7S.sub.C
Dependencies are inferred from the claim text.