Promotion of methane steam reforming by use of palladium membrane.

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Abstract
Steam reforming of methane was carried out in a membrane reactor where palladium was used as a hydrogen-permeating medium in membrane form. The particular palladium membrane consisted of a thin palladium film supported on a porous cylinder. The membrane gave high hydrogen flux in comparison with that through commercially obtainable palladium-alloy membrane. The rate of hydrogen permeation through the supported palladium membrane was inversely proportional to the thickness of palladium film, irrespective of the pore size of the supports. It was proved that the effect caused by use of palladium membrane on promotion of the reaction increased with decreasing film thickness, indicating that hydrogen permeation was the rate-determining step in this reaction system.

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