Process for removing ionizable species from catalyst surface...

B - Operations – Transporting – 01 – J

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B01J 37/06 (2006.01) B01J 23/50 (2006.01) C07D 301/10 (2006.01)

Patent

CA 2343783

This invention relates to a process for the preparation of a catalyst having improved properties, said process comprising selecting a carrier, lowering the concentration of ionizable species present on the surface of the carrier, and depositing a catalytically effective amount of one or more catalytically reactive metals on the carrier. The invention further relates to catalysts made from the process and to the use of such catalysts in alkene epoxidation processes. In the examples the lowering of the concentration of ionizable species is obtained by washing the alpha alumina carrier with boiling water. Then the dried carrier is impregnated with a promotor and silver.

L'invention concerne un procédé qui permet de préparer un catalyseur possédant des propriétés améliorées. Le procédé consiste à choisir un support, à abaisser la concentration des espèces ionisables présentes à la surface du support, puis à déposer sur ledit support une quantité catalytiquement active d'un ou de plusieurs métaux possédant une activité catalytique. L'invention concerne également les catalyseurs produits par ledit procédé et leur utilisation dans les opérations d'époxydation des alcènes. Dans les exemples, on diminue la concentration des espèces ionisables en lavant le support à base d'alpha-alumine avec de l'eau bouillante, puis on sèche le support et on l'imprègne avec un promoteur et de l'argent.

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