Über die Kinetik der Wasserstoffpermeation durch Nickel
Open Access
- 1 October 1967
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 22 (10) , 1581-1586
- https://doi.org/10.1515/zna-1967-1020
Abstract
The permeation rate of hydrogen through nickel foils of various thicknesses (6,7 μ≦ d≦ 1,83 mm) has been measured in the temperature range 423°K ≦ T ≦ 1000°K. The permeation rate P [Mol H2· cm-1·s-1] under stationary conditions is inversely proportional to the thickness of the foil over the whole temperature range. The experimental results are fitted by the relation P= (7,22·10-7/d) · exp (-52 400/RT). Diffusion contants D [cm2· s -1] have been determined by means of the time lag method and have been calculated from steady state permeation rates and from hydrogen solubility data. The results are in accordance within the limits of error. It is concluded that the rate determining step for the permeation is diffusion of hydrogen in nickel. Surface reactions are very fast.Keywords
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