Surface reaction and transport kinetics of hydrogen through palladium-based membranes under gas co-existing with hydrogen atmospheres
by Atsushi Unemoto, Nobuyuki Hirai, Atsushi Kaimai, Kazuhisa Sato, Takanori Otake, Keiji Yashiro, Junichiro Mizusaki, Tatsuya Kawada, Tatsuya Tsuneki, Yoshinori Shirasaki, Yoshu Ota, Isamu Yasuda
International Journal of Nuclear Hydrogen Production and Applications (IJNHPA), Vol. 2, No. 1, 2009

Abstract: In order to understand how gas co-existing with hydrogen affects the hydrogen permeability of a silver 23wt%-palladium membrane, the surface reaction of hydrogen was evaluated from the continuity of the surface reaction rate and the bulk diffusion flux of hydrogen based on the results of hydrogen-permeation measurements. The interference effect of the co-existing species was quantified as a function of temperature, partial pressure and the components of the co-existing gas. In order to investigate the behaviour of the co-existing species on the membrane surface, in situ observation using the Polarisation Modulated Infrared Reflection Absorption Spectroscopy (PM-IRRAS) was carried out. An infrared absorption peak due to the adsorption of carbon monoxide on the membrane was observed under the atmosphere of 7.8% carbon monoxide – 2.3% water vapour – 89.9% hydrogen. From the dependence of the infrared absorption peak on temperature, co-existing carbon monoxide was found to adsorb onto the membrane surface irreversibly.

Online publication date: Fri, 13-Mar-2009

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