Halide free precursors for catalysts

B - Operations – Transporting – 01 – J

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B01J 23/52 (2006.01) B01J 35/00 (2006.01) B01J 37/02 (2006.01) C07C 67/055 (2006.01) C07C 69/12 (2006.01)

Patent

CA 2547313

The present invention addresses at least four different aspects relating to catalyst structure, methods of making those catalysts and methods of using those catalysts for making alkenyl alkanoates. Separately or together in combination, the various aspects of the invention are directed at improving the production of alkenyl alkanoates and VA in particular, including reduction of by-products and improved production efficiency. A first aspect of the present invention pertains to a unique palladium/gold catalyst or pre-catalyst (optionally calcined) that includes rhodium or another metal. A second aspect pertains to a palladium/gold catalyst or pre~catalyst that is based on a layered support material where one layer of the support material is substantially free of catalytic components. A third aspect pertains to a palladium/gold catalyst or pre-catalyst on a zirconia containing support material. A fourth aspect pertains to a palladium/gold catalyst or pre- catalyst that is produced from substantially chloride free catalytic components.

L'invention concerne au moins quatre aspects différents relatifs à une structure de catalyseurs, à des procédés de production de ces derniers et à des procédés d'utilisation de ces catalyseurs pour produire des alcanoates d'alcényle. De manière séparée ou combinée, ces différents aspects visent à améliorer la production d'alcanoates d'alcényle et d'acétate de vinyle en particulier, par exemple pour réduire la formation de sous-produits et améliorer le rendement de production. Un premier aspect concerne un catalyseur ou un précatalyseur (éventuellement calciné) unique, à base de palladium/or, contenant du rhodium ou un autre métal. Un deuxième aspect concerne un catalyseur ou un précatalyseur à base de palladium/or, sur un matériau de support stratifié, une couche de ce dernier étant sensiblement exempte de constituants catalytiques. Un troisième aspect concerne un catalyseur ou un précatalyseur à base de palladium/or, sur un matériau de support contenant du zircone. Un quatrième aspect concerne un catalyseur ou un précatalyseur à base de palladium/or, produit à partir de constituants catalytiques sensiblement exempts de chlorures.

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