Catalyst, process for its production and its use for...

Details Catalyst, process for its production and its use for... Catalyst, process for its production and its use for...

B - Operations, Transporting

01

J

B01J 37/34 (2006.01) B01J 23/38 (2006.01) B01J 23/44 (2006.01) B01J 23/52 (2006.01) B01J 37/16 (2006.01) C07C 67/055 (2006.01) C07C 69/15 (2006.01)

Patent

CA 2240966

The invention relates to a process for producing supported shell catalysts comprising noble metals by UV photoreduction of noble metal salt precursors fixed to a support. For this purpose, the shaped supported body is impregnated with suitable noble metal salts which are then reduced to the metals in a zone close to the surface by means of UV radiation, preferably in the absence of a chemical reducing agent. The metal salts in the interior of the pellets which have not been irradiated and therefore have not been reduced are extracted using a solvent. The noble metal shell catalysts produced in this way can be used for many heterogeneously catalyzed reactions such as hydrogenations and oxidations. According to the invention, Pd/Au shell catalysts on porous ceramic supports, e.g. SiO2 shaped bodies, produced by this process can be used in the synthesis of vinyl acetate.

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