Method of making catalysts for the production of ethylene oxide

Details Method of making catalysts for the production of ethylene oxide Method of making catalysts for the production of ethylene oxide

B - Operations, Transporting

01

J

252/85

B01J 23/66 (2006.01)

Patent

CA 1146151

-12- ABRIDGEMENT An improved process for preparing a silver catalyst which comprises impregnating a porous alumina support with a silver salt, preferably silver nitrate, by contacting a quantity of the support with an aqueous solu- tion of the salt in sufficient amount to be completely absorbed by said support while under a vacuum. A dispers- ing agent is also employed in the aqueous silver salt solution. The support is dried by heating, e.g., 100°C, under vacuum and then, while still under vacuum, impreg- nated with a reducing agent employing an amount suffi- cient to be completely absorbed by the support. Subse- quent heating at a higher temperature, e.g., 250°C, reduces the silver salt to silver metal. A catalyst is produced which, when employed for the oxidation of ethyl- ene, permits the process to run 5°C-10°C cooler at the normal conversion, and also gives an improved yield. 27,422-F -12-

369607

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