Silver-based catalyst containing bromine and/or fluorine as an anionic component for the production of ethylene oxide
First Claim
1. A catalyst for the production of ethylene oxide by oxidation of ethylene, said catalyst comprising(A) silver,(B) (1) sodium in an amount of more than 1000 ppm (mg/kg of catalyst) based on the catalyst and (2) cesium as a cationic component, the amount of cesium being smaller than that of sodium and ranging from 10 ppm to 0.5% by weight based on the catalyst, and(C) at least one halogen element selected from bromine and fluorine as an anionic component, the amount of the halogen element being from 5 ppm to 0.1% by weight based on the catalyst.
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Abstract
A catalyst comprising sodium and cesium as a cationic component and at least one of bromine and fluorine as an anionic component in addition to silver which is a typical conventional catalyst component for the production of ethylene oxide by oxidation of ethylene. Use of the catalyst of the invention gives ethylene oxide at an improved selectivity.
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Citations
8 Claims
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1. A catalyst for the production of ethylene oxide by oxidation of ethylene, said catalyst comprising
(A) silver, (B) (1) sodium in an amount of more than 1000 ppm (mg/kg of catalyst) based on the catalyst and (2) cesium as a cationic component, the amount of cesium being smaller than that of sodium and ranging from 10 ppm to 0.5% by weight based on the catalyst, and (C) at least one halogen element selected from bromine and fluorine as an anionic component, the amount of the halogen element being from 5 ppm to 0.1% by weight based on the catalyst.
Specification