Process for the preparation of a microspheroidal catalyst

B - Operations – Transporting – 01 – J

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B01J 37/02 (2006.01) B01J 23/52 (2006.01) B01J 23/58 (2006.01) C01B 21/02 (2006.01) C01C 1/00 (2006.01) C02F 1/70 (2006.01) B01J 21/08 (2006.01) B01J 37/00 (2006.01)

Patent

CA 2472365

A process for impregnating microspheroidal catalyst support particles with at least one compound of a catalytically active group VIII noble metal, which process comprises the steps of: (a') impregnating the microspheroidal support particles by the incipient wetness technique with an aqueous solution of the at least one catalytically active group VIII noble metal, whilst agitating the support particles; and (b') drying the impregnated support particles produced in step (a')whilst agitating the impregnated support particles. The microspheroidal support particles are preferably silica, alumina, zirconia or mixtures thereof. Where the catalytically active group VIII noble metal is palladium, the process may be used to prepare a catalyst active for the fluid bed acetoxylation of ethylene to produce vinyl acetate.

L'invention a trait à un procédé d'imprégnation de particules de support de catalyseur microsphériques avec au moins un composé d'un métal noble du groupe VIII catalytiquement actif. Ce procédé comprend les étapes consistant à: (a') imprégner les particules de support microsphériques par le procédé appelé <= incipient wetness >= (humidité initiale) avec une solution aqueuse d'au moins un métal noble du groupe VIII catalytiquement actif, tout en agitant les particules de support ; et (b') sécher les particules de support imprégnées produites dans l'étape (a') tout en agitant les particules de support imprégnées. Les particules de support microsphériques sont constituées de préférence de silicium, d'alumine, de zircone ou de mélanges de ceux-ci. Lorsque le métal noble du groupe VIII catalytiquement actif est le palladium, le procédé peut être utilisé pour préparer un catalyseur actif pour l'acétoxylation sur lit fluidisé d'éthylène, afin de produire de l'acétate de vinyle.

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