Epoxidation catalyst

B - Operations – Transporting – 01 – J

Patent

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Details

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

Patent

CA 2166614

This invention relates to an epoxidation catalyst having improved selectivity stability which catalyst comprises silver, a promoting amount of alkali metal, a promoting amount of magnesium, a promoting amount of rhenium and, optionally, a promoting amount of rhenium co-promoter selected from sulphur, molybdenum, tungsten, chromium and mixtures thereof, supported on a carrier comprising at least 85 percent by weight of alpha alumina and from 0.001 to 2 percent by weight (measured as the clement) of magnesium in the form of an oxide.

Cette invention se rapporte à un catalyseur d'époxydation ayant une stabilité de sélectivité améliorée, et qui comprend de l'argent, une quantité d'activation de métal alcalin, de magnésium, de rhénium et, éventuellement, une quantité d'activation du copromoteur de rhénium sélectionné parmi le soufre, le molybdène, le tungstène, le chrome et des mélanges de ceux-ci, supportés sur un vecteur comprenant au moins 85 % en poids d'oxyde d'aluminium alpha et de 0,001 à 2 % en poids (mesuré comme élément) de magnésium se présentant sous la forme d'un oxyde.

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