Process for preparing epoxidation catalysts

Details Process for preparing epoxidation catalysts Process for preparing epoxidation catalysts

B - Operations, Transporting

01

J

B01J 23/68 (2006.01) B01J 23/66 (2006.01) B01J 23/89 (2006.01) C07D 301/10 (2006.01)

Patent

CA 2232942

This invention relates to a process for the preparation of a catalyst suitable for the epoxidation of olefins having no allylic hydrogen, in I particular ethylene which process comprises depositing a promoting amount of a salt of a rare earth metal and a promoting amount of a salt of an alkaline earth metal and/or a salt of a Group VIII transition metal on a porous, refractory support, calcining the support, and thereafter depositing a catalytically effective amount of silver, a promoting amount of alkali metal, optionally a promoting amount of rhenium and optionally a promoting amount of a rhenium co-promoter selected from sulphur, molybdenum, tungsten, chromium, phosphorus, boron and mixtures thereof, on the support, and subsequently drying the support.

L'invention concerne un procédé de préparation d'un catalyseur approprié à l'époxydation d'oléfines ne comprenant pas d'hydrogène allylique, notamment de l'éthylène, ce procédé comprenant les étapes consistant à déposer, sur un support réfractaire poreux, une quantité promotrice d'un sel métallique de terre rare ainsi qu'une quantité promotrice d'un sel d'un métal alcalino-terreux et/ou d'un sel d'un métal de transition du groupe VIII, puis à calciner ce support, à déposer ensuite sur celui-ci une quantité d'argent, efficace sur le plan catalytique, une quantité promotrice d'un métal alcalin, éventuellement une quantité promotrice de rhénium et, le cas échéant, une quantité promotrice d'un copromoteur de rhénium choisi parmi soufre, molybdène, tungstène, chrome, phosphore, bore et des mélanges de ceux-ci, et enfin à sécher le support.

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