Supported palladium-gold catalysts and preparation of vinyl...

B - Operations – Transporting – 01 – J

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B01J 23/68 (2006.01) C07C 67/055 (2006.01)

Patent

CA 2742615

Disclosed is a catalyst. The catalyst comprises palladium, gold, and a support comprising titanium dioxide and tungsten trioxide. The support preferably comprises from 75 wt% to 99 wt% of titanium dioxide and from 1 wt% to 25 wt% of tungsten trioxide. A method for preparing the catalyst is also disclosed. The method comprises impregnating the support with a palladium compound and a gold compound, calcining the impregnated support, and then reducing the calcined support. Further disclosed is a method for preparing vinyl acetate with the catalyst. The catalyst exhibits improved catalytic activity and selectivity.

La présente invention concerne un catalyseur comprenant du palladium, de lor, et un support comprenant du dioxyde de titane et du trioxyde de tungstène. Le support comprend de préférence de 75 % en poids à 99 % en poids de dioxyde de titane, et de 1 % en poids à 25 % en poids de trioxyde de tungstène. L'invention concerne également un procédé de préparation du catalyseur qui consiste à imprégner le support avec un composé de palladium et un composé d'or, calciner le support imprégné, et enfin le réduire. Linvention concerne en outre un procédé de préparation d'acétate de vinyle avec le catalyseur. Ce dernier présente une activité catalytique et une sélectivité améliorées.

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