Silver-based catalyst and an epoxidation process using the...

B - Operations – Transporting – 01 – J

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B01J 23/66 (2006.01) B01J 21/04 (2006.01) B01J 21/12 (2006.01) B01J 23/50 (2006.01) B01J 23/68 (2006.01) B01J 35/10 (2006.01) B01J 37/00 (2006.01) C07C 29/10 (2006.01) C07C 213/04 (2006.01) C07D 301/10 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2477069

A catalyst which comprises a carrier and silver deposited on the carrier, which carrier has a surface area of at least 1 m2/g, and a pore size distribution such that pores with diameters in the range of from 0.2 to 10 ~m represent at least 70 % of the total pore volume and such pores together provide a pore volume of at least 0.27 ml/g, relative to the weight of the carrier; a process for the preparation of a catalyst which process comprises depositing silver on a carrier, wherein the carrier has been obtained by a method which comprises forming a mixture comprising: a) from 50 to 90 %w of a first particulate a-alumina having an average particle size (d50) of from more than 10 up to 100 ~m; and b) from 10 to 50 %w of a second particulate a- alumina having an average particle size (d50) of from 1 to 10 ~m; %w being based on the total weight of a-alumina in the mixture; and shaping the mixture into formed bodies and firing the formed bodies to form the carrier, and a process for the epoxidation of an olefin, which process comprises reacting an olefin with oxygen in the presence of a said catalyst.

L'invention porte sur un catalyseur comportant de l'argent déposé sur un support dont la surface est d'au moins 1 m<sp>2</sp>/g, et la distribution en taille des pores telle que les pores d'un diamètre compris entre 0,2µ et 10µ représentent au moins 70% du volume total des pores et constituent ensemble un volume de 0,27 ml/g de poids du support. L'invention porte également sur le procédé de préparation du catalyseur consistant: à déposer de l'argent sur un support obtenu en formant un mélange de (a) 50 à 90 % en poids d'un premier particulât d'.alpha.-alumine dont les particules présentent une taille moyenne (d50) comprise entre plus de 10µ et 100µ, et de (b) 10 à 50 % en poids d'un deuxième particulât d'.alpha.-alumine dont les particules présentent une taille moyenne (d50) comprise entre 1µ et 10µ et dont le % en poids se base sur le poids total d'.alpha.-alumine dans le mélange; puis à mettre le mélange en formes qu'on fait cuire pour obtenir des supports. L'invention porte en outre sur un procédé d'époxydation d'une oléfine, consistant à faire réagir une oléfine avec de l'oxygène en présence dudit catalyseur.

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