Carbon monoxide concentration reduction apparatus, method of...

C - Chemistry – Metallurgy – 01 – B

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C01B 3/58 (2006.01) B01J 23/58 (2006.01) B01J 23/60 (2006.01) H01M 8/04 (2006.01) H01M 8/06 (2006.01)

Patent

CA 2306385

A construction for reducing the concentration of carbon monoxide in a hydrogen- rich gas fed as a fuel gas into a fuel cell, intended to meet the need that the selective oxidation of carbon monoxide for reducing the concentration of carbon monoxide should maintain a satisfactorily high level of activity in a broader temperature range. A selective CO oxidation section (34) for reducing the concentration of carbon monoxide in a hydrogen-rich gas fed into a fuel cell (20) is provided with a catalyst for selectively oxidizing carbon monoxide, comprising ruthenium as a main component and a second element, e.g., lithium. This construction enables the activity of selective carbon monoxide oxidation to be maintained on a satisfactorily high level in a broader temperature range in the selective CO oxidation section (34).

L'invention porte sur une structure permettant de réduire la concentration du monoxyde de carbone dans un gaz riche en oxygène tel qu'un gaz combustible amené dans un élément à carburant. Cette structure a été conçue pour que l'oxydation sélective permettant de réduire la concentration du monoxyde de carbone maintienne son activité à un niveau élevé satisfaisant dans une plus large plage de températures. La section (34) de l'oxydation sélective du CO, où s'effectue la réduction de la concentration du monoxyde carbone dans un gaz riche en oxygène amené dans un élément à carburant (20), est dotée d'un catalyseur comprenant du ruthénium comme composant principal et un second élément tel que le lithium. Cette structure permet de maintenir l'activité de l'oxydation sélective du monoxyde de carbone à un niveau élevé satisfaisant dans une plus large plage de températures dans la section (34) d'oxydation sélective du CO.

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