Catalysts for the gas-phase oxidation of ethylene and acetic...

B - Operations – Transporting – 01 – J

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B01J 23/58 (2006.01) B01J 23/52 (2006.01) B01J 23/66 (2006.01) C07C 67/055 (2006.01)

Patent

CA 2366465

The invention relates to a supported catalyst and the production and use thereof in the synthesis of vinyl acetate in the gaseous phase from ethylene, acetic acid and oxygen, or from gases containing oxygen, whereby the activity and selectivity are simultaneously improved. The catalyst contains palladium, at least one alkali metal compound and optionally one or more catalyst accelerators, in particular, gold, barium and/or cadmium on a porous support. Said support contains at least one reducible metal oxide, in particular oxides of the elements of groups IIIb, IVb, Vb, VIb from the periodic table of elements. Once the support has been loaded with at least one palladium compound, a reduction is carried out at a temperature of > 200 °C.

L'invention concerne un catalyseur supporté, ainsi que sa fabrication et son utilisation pour la synthèse d'acétate de vinyle en phase gazeuse à partir d'éthylène, d'acide acétique et d'oxygène ou de gaz contenant de l'oxygène, qui permet d'améliorer l'activité et la sélectivité. Le catalyseur contient du palladium, au moins un composé à base de métal alcalin et éventuellement un ou plusieurs promoteurs, notamment l'or, le baryum et/ou le cadmium, sur un support poreux contenant au moins un oxyde métallique réductible, notamment un oxyde d'éléments des groupes IIIb, IVb, Vb ou VIb de la classification périodique. On charge le support avec au moins un composé à base de palladium, puis on effectue une réduction à une température supérieure à 200 DEG C.

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