Shift conversion on having improved catalyst composition

Details Shift conversion on having improved catalyst composition Shift conversion on having improved catalyst composition

C - Chemistry, Metallurgy

01

B

C01B 3/16 (2006.01) B01J 8/02 (2006.01) B01J 23/63 (2006.01) H01M 8/06 (2006.01) B01J 21/06 (2006.01)

Patent

CA 2446245

A shift converter (16) in a fuel processing subsystem (14, 16, 18) for a fuel cell (12) uses an improved catalyst composition (50) to reduce the amount of carbon monoxide in a process gas for the fuel cell (12). The catalyst composition (50) is a noble metal catalyst having a promoted support of mixed metal oxide, including at least both ceria and zirconia. Cerium is present in the range of 30 to 50 mole%, and zirconium is present in the range of 70 to 50 mole%. Additional metal oxides may also be present. Use of the catalyst composition (50) obviates the requirement for prior reducing of catalysts, and minimizes the need to protect the catalyst from oxygen during operation and/or shutdown.

Dans un sous-système de traitement du combustible (14, 16, 18) pour une pile à combustible (12), un réacteur de conversion du CO (16) utilise une composition catalytique améliorée (50) afin de réduire la quantité de monoxyde de carbone dans un gaz de transformation pour ladite pile à combustible (12). Cette composition catalytique (50) est un catalyseur à base de métaux nobles présentant un support activé d'un mélange d'oxydes métalliques, qui comprend au moins 30 à 50 % en moles d'oxyde de cérium et 70 à 50 % en moles d'oxyde de zirconium. Des oxydes métalliques supplémentaires peuvent également être présents. L'utilisation de cette composition catalytique (50) rend inutile toute réduction préalable de catalyseurs et minimise la nécessité de protéger de l'oxygène ce catalyseur en cours de fonctionnement et/ou à l'arrêt.

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