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“Superpermeability” and “pumping” of atomic hydrogen through palladium membranes |
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| Authors: | ML Zheludkevich AG Gusakov AG Voropaev EN Kozyrski SA Raspopov AA Vecher |
| Institution: | aDepartment of Chemistry, Belarus State University, 14 Leningradskaya Street, Minsk 220050, Belarus;bDepartment of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;cDepartment of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada |
| Abstract: | Permeation of atomic as well as molecular hydrogen through palladium membranes has been investigated experimentally in the temperature range from room temperature to 200 °C and at a higher incident flux of hydrogen atoms on palladium surface than in previous studies. The results demonstrate that phenomena of ‘superpermeability’ and ‘pumping’ of atomic gases through metal membranes are of a common nature. A theoretical model based on chemical thermodynamics and diffusion theory adequately describes the quantitative relationships observed in experiments. It was found that permeability of atomic hydrogen depends strongly on the magnitude of surface incident flux and membrane temperature. |
| Keywords: | Atomic hydrogen Permeation Palladium membrane Thermodynamical model Superpermeability |
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