Surface reaction of hydrogen on a palladium alloy membrane under co-existence of H2O, CO, CO2 or CH4☆
Surface reaction of hydrogen on a palladium alloy membrane under co-existence of H2O, CO, CO2 or CH4☆
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DOI：
10.1016/j.ijhydene.2007.04.030
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发表时间：
2007-11
影响因子：
7.2
通讯作者：
A. Unemoto;A. Kaimai;Kazuhisa Sato;T. Otake;K. Yashiro;J. Mizusaki;T. Kawada;T. Tsuneki;Y. Shirasaki;I. Yasuda
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文献类型：
--
作者：
A. Unemoto;A. Kaimai;Kazuhisa Sato;T. Otake;K. Yashiro;J. Mizusaki;T. Kawada;T. Tsuneki;Y. Shirasaki;I. Yasuda
通过氢渗透测量，研究了与氢共存的气体对厚度为20μm的银23wt% -钯合金的氢渗透性能的影响。水蒸气、二氧化碳、一氧化碳或甲烷的共同引入降低了氢通量。测量时的温度越低，氢通量的减少就越明显。通过对氢渗透测量结果的精确分析，得到了表面反应的经验速率方程。发现速率常数取决于温度、分压和共存气体的组分。利用得到的表面反应速率方程进行了性能模拟。结果表明，当温度高于873K时，对于厚度大于10μm的膜，共存气体的干扰效应可以忽略不计。
Hydrogen permeation measurements were carried out to investigate how a co-existing gas with hydrogen affects the hydrogen permeability of a silver 23wt%–palladium alloy of 20μm in thickness. The hydrogen flux was reduced by the co-introduction of water vapor, carbon dioxide, carbon monoxide or methane. The lower the temperatures at which the measurements were carried out, the more obvious were the reductions of the hydrogen fluxes. An empirical rate equation of the surface reaction was obtained by a precise analysis of the results of hydrogen permeation measurements. The rate constant was found to depend on temperature, partial pressure and the components of the co-existing gas. Performance simulation was carried out utilizing the obtained rate equation of the surface reaction. It suggests that an interference effect of the co-existing gas is negligible at temperatures above 873K for the membranes thicker than 10μm at 873K.