Anomalous Temperature Dependence of Hydrogen Permeability through Palladium-Silver Binary Alloy Membrane and Its Analysis Based on Hydrogen Chemical Potential

被引：9

作者：

Suzuki, A. ^{[1
,4
]}

Yukawa, H. ^{[1
]}

Nambu, T. ^{[2
]}

Matsumoto, Y. ^{[3
]}

Murata, Y. ^{[1
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Dept Mat Sci & Engn, Nagoya, Aichi 4648603, Japan

[2] Suzuka Coll, Natl Inst Technol, Suzuka 5100294, Japan

[3] Oita Coll, Natl Inst Technol, Oita 8700152, Japan

[4] Nagoya Univ, Nagoya, Aichi 4648601, Japan

来源：

MATERIALS TRANSACTIONS | 2016年 / 57卷 / 05期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

hydrogen permeable membrane; Pd-based alloys; alpha-alpha ' phase transition; rate-limiting process; hydrogen chemical potential; AG ALLOY; PERMEATION; SYSTEM; THIN; WASSERSTOFF; LEGIERUNGEN; METAL;

D O I：

10.2320/matertrans.M2016020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The hydrogen permeability of Pd-Ag alloy membranes has been investigated over a wide temperature range between 100 degrees C and 500 degrees C. The hydrogen permeation coefficient, Phi, for Pd-23mol%Ag decreases with decreasing temperature above 300 degrees C, in good agreement with the previous literature. However, Phi starts to increases below 250 degrees C, and a peak is observed at around 180 degrees C. Considering the silver concentration and operating temperature, the alpha-alpha' phase transition never occurs in this condition. In other words, the alpha-alpha' phase transition is not the reason for the anomalous peak behavior of Pd-23mol%Ag alloy at low temperature. In addition, it is confirmed that the diffusion limiting hydrogen permeation reaction takes place from room temperature up to 500 degrees C. To understand the reason for the peak appearance, the hydrogen permeability has been analyzed in view of the new description of hydrogen permeation based on hydrogen chemical potential. As a result, it is found that the temperature dependence of the PCT factor,f(PCT), is dominant for the peak appearance, meaning that the corresponding pressure composition isotherms (PCT curves) are essential for the understanding of hydrogen permeability of the alloy. Dependences of the pressure condition and silver concentration on the peak behavior have also been investigated. The peak temperature increases with increasing the hydrogen pressure at feed side. In addition, the peak appears at lower temperature and becomes remarkable with decreasing silver concentration of Pd-Ag alloy membrane. In other words, the composition of Pd-Ag alloy membranes must be designed based on the operating temperature or pressure condition. Thus, this study suggests new possibilities of alloy design for Pd-Ag alloy membranes.

引用

页码：695 / 702

页数：8

共 26 条

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