B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 37/02 (2006.01) B01J 23/52 (2006.01) B01J 23/58 (2006.01) B01J 23/66 (2006.01) C07C 67/055 (2006.01)
Patent
CA 2338961
The invention relates to a supported catalyst containing palladium and doped with hafnium for the heterogeneously catalyzed gas-phase oxidation of ethylene and acetic acid into vinyl acetate. To this end the porous support, for example on a SiO2 basis, during or after coating with the active metals and promoters is exposed to suitable hafnium compounds, for example by saturation with soluble hafnium compounds. The advantage of this hafnium-doped catalyst system is its improved activity and long-term stability in comparison with undoped catalysts.
L'invention concerne un catalyseur supporté contenant du palladium et dopé avec du Hafnium, destiné à l'oxydation en phase gazeuse, sous catalyse hétérogène, d'éthylène et d'acide acétique pour donner de l'acétate vinylique. A cet effet, le support poreux, par exemple à base de SiO2, est exposé, pendant ou après le revêtement avec des métaux actifs et des promoteurs, à des composés de Hf appropriés, par exemple par imprégnation avec des composés de Hf solubles. L'avantage de ce système de catalyseur avec dopage au Hf réside dans l'amélioration de son activité et de sa stabilité à long terme par rapport à un catalyseur non dopé.
Dingerdissen Uwe
Hagemeyer Alfred
Werner Harald
Celanese Chemicals Europe Gmbh
Fetherstonhaugh & Co.
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