Measurement and modeling of hydrogen transport through high-flux Pd membranes

F.C. Gielens, D.H. Tong, M.A.G. Vorstman, J.T.F. Keurentjes

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    Abstract

    The permeability of H2-selective palladium membranes fabricated with microsystem technology has been studied. The permeation experiments have been carried out at temperatures between 623 and 873 K at H2 feed partial pressures of 0.2–1.0 bar. At 823 K, a permeance based on the free membrane area of 18 mol H2/m2 s bar0.58 has been measured for a Pd membrane with a thickness of 0.5 μm. From the permeation experiments the rate determining transport step and the stability of the membranes have been determined. At 873 K the H2/He selectivity decreases rapidly, indicating the formation of pinholes at higher temperatures. From a combination of experiments and computer simulations the limiting transport step has been determined to be H-atom diffusion through the membrane at elevated temperatures and H2 surface reactions at the retentate side at lower temperatures
    Original languageUndefined
    Article number10.1016/j.memsci.2006.11.029
    Pages (from-to)15-25
    Number of pages11
    JournalJournal of membrane science
    Volume289
    Issue number06472/1-2
    DOIs
    Publication statusPublished - 18 Feb 2007

    Keywords

    • EWI-9926
    • IR-67133
    • METIS-241637

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