Process for producing coated catalysts by cvd

B - Operations – Transporting – 01 – J

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

Patent

CA 2336026

The invention relates to a method for preparing supported catalysts containing Pd/Au by a CVD (chemical vapour deposition) process using evaporable Pd/au precursors. According to said method, appropriate noble-metal precursors are deposited in the vapour phase on porous supports, then chemically or thermally reduced to metal and hence fixed on the support. The invention relates especially to producing Pd/Au shell catalysts on porous supports according to said method. Catalysts so produced can be used for a variety of heterogeneous catalysis reactions such as hydrogenation and oxidation. Pd/Au shell catalysts produced according to said method can be used for the synthesis of vinyl acetate.

Procédé de préparation de catalyseurs supportés contenant Pd/Au par dépôt chimique en phase vapeur de précurseurs Pd/Au pouvant être évaporés. Selon ledit procédé, des précurseurs de métaux nobles appropriés sont déposés lors de la phase vapeur sur des supports poreux, puis réduits à l'état de métal de manière chimique ou thermique et par là même fixés sur le support. La présente invention concerne en particulier la fabrication de catalyseurs Pd/Au en coquille sur des supports poreux selon ledit procédé. Les catalyseurs ainsi fabriqués peuvent être utilisés pour toute une variété de réactions de catalyse hétérogène telles que l'hydrogénation et l'oxydation. Les catalyseurs Pd/Au en coquille fabriqués selon ledit procédé peuvent être utilisés dans la synthèse de l'acétate de vinyle.

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