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学科主题: 物理化学
题名: PdCu Membranes for Hydrogen Separation : Stability and Application Ranges
作者: 哥德巴赫 ;  Yuan LX(袁立祥) ;  Xu HY(徐恒泳)
会议文集: PdCu Membranes for Hydrogen Separation : Stability and Application Ranges
会议名称: 5th Forum on New Materials
会议日期: 2010-6-13
出版日期: 2011
会议地点: 托斯卡纳区
通讯作者: 哥德巴赫
出版者: 待补充
出版地: 待补充
合作性质: 分会口头报告
部门归属: 801
主办者: CIMTEC Conferences
摘要: PdCu membranes attract much attention because of their lowtemperature stability and sulfur tolerance, which renders them interesting for applications ranging from small-scale H2 purification for fuel cells to CO2 capture in industrial power plants. However, the PdCu phase diagram includes bcc and fcc structures below 600 °C that are separated by miscibility gaps. The optimum bcc Pd47Cu53 alloy is only stable up to 450 °C as it borders to a gap, and its H2 permeability declines fast, if the alloy composition deviates only by a few at%. Excursions into the gap due to overheating lead to structural and compositional heterogeneity. This inhomogeneity is irreversible at practical membrane operation temperatures and it can trigger a loss of membrane integrity as a result of uneven expansion of fcc and bcc domains during charging and discharging of H2, because the H2 uptake of fcc and bcc PdCu phases varies by orders of magnitude. Eventually fissures appear between those domains, which can compromise the membranes permselectivity. This structure-related instability must be also taken into consideration if ultra-thin PdCu membranes are prepared by electroless plating.
英文摘要: PdCu membranes attract much attention because of their lowtemperature stability and sulfur tolerance, which renders them interesting for applications ranging from small-scale H2 purification for fuel cells to CO2 capture in industrial power plants. However, the PdCu phase diagram includes bcc and fcc structures below 600 °C that are separated by miscibility gaps. The optimum bcc Pd47Cu53 alloy is only stable up to 450 °C as it borders to a gap, and its H2 permeability declines fast, if the alloy composition deviates only by a few at%. Excursions into the gap due to overheating lead to structural and compositional heterogeneity. This inhomogeneity is irreversible at practical membrane operation temperatures and it can trigger a loss of membrane integrity as a result of uneven expansion of fcc and bcc domains during charging and discharging of H2, because the H2 uptake of fcc and bcc PdCu phases varies by orders of magnitude. Eventually fissures appear between those domains, which can compromise the membranes permselectivity. This structure-related instability must be also taken into consideration if ultra-thin PdCu membranes are prepared by electroless plating.
语种: 英语
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115927
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
哥德巴赫,Yuan LX,Xu HY. PdCu Membranes for Hydrogen Separation : Stability and Application Ranges[C]. 见:5th Forum on New Materials. 托斯卡纳区. 2010-6-13.
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