Heterogeneous bimetallic palladium-gold catalyst for vinyl...

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B01J 23/52 (2006.01) B01J 23/44 (2006.01) B01J 23/58 (2006.01) B01J 23/66 (2006.01) B01J 37/02 (2006.01) C07C 67/055 (2006.01) C07C 69/15 (2006.01)

Patent

CA 2254912

This invention provides a heterogeneous bimetallic palladium-gold catalyst for vinyl acetate production from ethylene, acetic acid and oxygen. An invention catalyst is prepared by forming a first shell dispersion coating of colloidal palladium on the catalyst support surface, and super-imposing a second shell dispersion coating of colloidal gold metal on the catalyst support surface. An organometallic gold compound is employed to apply the gold dispersion on the catalyst support surface. The organometallic gold compound does not require a fixing procedure. A preferred invention palladium-gold catalyst has a high gold metal retention, and exhibits durability and long term selectivity in vinyl acetate production.

Catalyseur bimétallique hétérogène au palladium-or pour la production d'acétate de vinyle à partir d'éthylène, d'acide acétique et d'oxygène. On prépare le catalyseur selon l'invention en formant un premier revêtement à dispersion de palladium colloïdal, formant une enveloppe, sur la surface de support du catalyseur et en superposant un deuxième revêtement à dispersion d'or colloïdal, formant une enveloppe, sur la surface de support du catalyseur. Un composé d'or organométallique est utilisé pour appliquer la dispersion d'or sur ladite surface. Ce composé ne requiert aucune procédure de fixation. Un catalyseur au palladium-or préféré selon l'invention présente une aptitude de retenue de l'or élevée, un bonne durabilité et une sélectivité de longue durée dans la production de l'acétate de vinyle.

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