Pretreatment of catalyst support to enhance catalytic...

B - Operations – Transporting – 01 – J

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B01J 23/83 (2006.01) B01J 23/63 (2006.01) B01J 37/02 (2006.01) C01B 3/04 (2006.01) C01B 17/04 (2006.01) C07C 46/00 (2006.01) C07C 50/04 (2006.01) C07C 50/12 (2006.01) C07C 50/18 (2006.01)

Patent

CA 2212892

A process is provided for preparing a catalyst system containing a catalyst support and an associated catalyst used to catalytically dehydrogenate a hydroquinone. In accordance with the process, the catalyst support is pretreated by selecting a porous alumina of silica catalyst support and contacting it with an aqueous solution of an alkali metal salt, alkaline earth metal salt, or rare earth metal salt to produce the corresponding metal oxide on the surface of the support in a quantity sufficient to reduce the acidity thereof. The metal oxide-treated support is then contacted with a metal catalyst to produce a catalyst system having enhanced utility in the selective conversion of a hydroquinone to its corresponding quinone and hydrogen gas.

On décrit un procédé d'élaboration d'un système catalyseur contenant un support catalyseur et un catalyseur connexe utilisés pour assurer la déshydrogénation catalytique d'une hydroquinone. Ledit procédé consiste à prétraiter le support catalyseur en sélectionnant un support catalyseur poreux d'oxyde l'aluminium ou de dioxyde de silicium et en le mettant en contact avec une solution aqueuse d'un sel de métaux alcalins, d'un sel de métaux alcalino-terreux ou d'un sel de métaux de terres rares, afin de produire à la surface dudit support la quantité suffisante d'oxyde métallique correspondant pour que son acidité soit réduite. On met ensuite en contact le support traité à l'oxyde métallique avec un catalyseur métallique afin de produire un système catalyseur qui sera plus efficace dans la conversion sélective d'une hydroquinone en quinone et gaz hydrogène correspondants.

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