Alloy catalyst for oxidation of hydrogen

B - Operations – Transporting – 01 – J

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B01J 23/75 (2006.01) H01M 4/90 (2006.01)

Patent

CA 2016514

The specification discloses an alloy catalyst for oxidation of hydrogen which is prepared by heat treating a material comprising an amorphous alloy represented by the formula: ZrxCo(100-x) (wherein 10 atomic % ~ x ~ 80 atomic %), according to the following three-steps in an oxidizing atmosphere: first heat-treatment step at a temperature at which the foregoing alloy stably exists as an amorphous single phase; second heat-treatment step at a temperature at which the alloy exists as a mixed phase of a metastable phase and an amorphous phase; and third-heat treatment step at a temperature at which the alloy is entirely transformed into a crystalline phase. The alloy catalyst of the present invention is a highly active catalyst for oxidation of hydrogen and exhibits a superior catalytic efficiency especially in catalytic combustion of hydrogen and in deoxidation and dehydrogenation of a gas mixture of hydrogen and oxygen.

L'invention porte sur un catalyseur à base d'alliage pour l'oxydation de l'hydrogène; il est préparé par traitement thermique d'une matière renfermant un alliage amorphe de formule ZrxCo(100-x) (où 10 % atomique ~ x ~ 80 % atomique), en suivant les trois étapes suivantes sous une atmosphère oxydante : premier traitement thermique à une température à laquelle l'alliage ci-dessus existe sous forme de phase amorphe unique; second traitement thermique à une température à laquelle l'alliage existe sous forme de phase mixte, comprenant une phase métastable et une phase amorphe; troisième traitement thermique à une température où l'alliage est entièrement transformé en une phase cristallisée. L'alliage catalytique de l'invention est très actif pour l'oxydation de l'hydrogène et offre un rendement catalytique supérieur, particulièrement pour la combustion catalytique de l'hydrogène, ainsi que pour la désoxydation et la déshydrogénation d'un mélange gazeux d'hydrogène et d'oxygène.

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