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


Gielens, F.C. and Tong, D.H. and Vorstman, M.A.G. and Keurentjes, J.T.F. (2007) Measurement and modeling of hydrogen transport through high-flux Pd membranes. Journal of Membrane Science, 289 (1-2). pp. 15-25. ISSN 0376-7388

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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
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Copyright:© 2007 Elsevier Science
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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