"Superpermeability" and "pumping" of atomic hydrogen through palladium membranes

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 degrees 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. (c) 2008 Elsevier B.V. All rights reserved.

keywords

MOLECULAR-OXYGEN

subject category

Engineering; Polymer Science

authors

Zheludkevich, ML; Gusakov, AG; Voropaev, AG; Kozyrski, EN; Raspopov, SA; Vecher, AA

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