Pd-Ag合金膜の水素透過能における特異的な温度依存性と水素の化学ポテンシャルに基づく解析

• 鈴木 飛鳥

  名古屋大学大学院工学研究科マテリアル理工学専攻

• 湯川 宏

  名古屋大学大学院工学研究科マテリアル理工学専攻

• 南部 智憲

  鈴鹿工業高等専門学校材料工学科

• 松本 佳久

  大分工業高等専門学校機械工学科

• 村田 純教

  名古屋大学大学院工学研究科マテリアル理工学専攻

書誌事項

タイトル別名

• Anomalous Temperature Dependence of Hydrogen Permeability through Palladium–Silver Binary Alloy Membrane and Its Analysis Based on Hydrogen Chemical Potential
• Pd-Ag ゴウキンマク ノ スイソ トウカノウ ニ オケル トクイテキ ナ オンド イソンセイ ト スイソ ノ カガク ポテンシャル ニ モトズク カイセキ

抄録

The hydrogen permeability of Pd–Ag alloy membranes has been investigated over a wide temperature range between 100°C and 500°C. The hydrogen permeation coefficient, Φ, for Pd–23 mol%Ag decreases with decreasing temperature above 300°C, in good agreement with the previous literature. However, Φ starts to increases below 250°C, and a peak is observed at around 180°C. Considering the silver concentration and operating temperature, the α–α′ phase transition never occurs in this condition. In other words, the α–α′ phase transition is not the reason for the anomalous peak behavior of Pd–23 mol%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°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.

収録刊行物

• 日本金属学会誌

  日本金属学会誌 81 (6), 327-334, 2017

  公益社団法人 日本金属学会

キーワード

• hydrogen permeable membrane
• palladium-based alloys
• α–α′ transformation
• rate–limiting process
• hydrogen chemical potential

詳細情報

• CRID: 1390282681467863168
• NII論文ID: 130005678930
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet.j2017008
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 028305789
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028305789
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/81/6/81_J2017008/_pdf
• 本文言語コード: ja
• データソース種別:
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  • NDL
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