Silver catalyst for production of ethylene oxide and method...

B - Operations – Transporting – 01 – J

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B01J 23/66 (2006.01) B01J 21/12 (2006.01) B01J 37/02 (2006.01) C07D 301/10 (2006.01)

Patent

CA 2089510

A catalyst for the production of ethylene oxide is disclosed which comprises an .alpha.-alumina carrier having the outer surface thereof and the surface of pores therein coated with an amorphous silica-alumina mixture having a total Si and Al content in the range of from 3 x 10 -4 to 2 x 10 -1 g/g of carrier and an Si/Al ratio in the range of from 0.05 to 50.0 g/g, 5 to 25% by weight based on perfected catalyst of minute metallic silver particles, and 0.0001 to 0.05 gram equivalent weight per kg of perfected catalyst of cesium. The catalyst, when used for the production of ethylene oxide by the catalytic vapor-phase oxidation of ethylene with molecular oxygen, possesses high selectivity, high activity, and high durability to ensure a long service life.

Catalyseur pour la production d'oxyde d'éthylène, comportant un véhicule à base d'alpha-alumine, dont la surface externe et la surface des pores internes sont revêtues d'un mélange d'alumine-silice amorphe, avec une teneur totale en Si et en Al de 3 x 10-4 à 2 x 10-1 g/g de véhicule, un rapport massique Si/Al de l'ordre de 0,05 à 50,0, 5 à 25 % en poids - pourcentage basé sur le catalyseur amélioré - de minuscules particules d'argent métallique, et 0,0001 à 0,05 équivalent-gramme de césium par kg de catalyseur amélioré. Lorsqu'il est employé pour la production d'oxyde d'éthylène à l'aide du procédé d'oxydation catalytique en phase vapeur par l'oxygène moléculaire, le catalyseur possède une sélectivité, une activité et une durabilité élevées.

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