DICP OpenIR
Subject Area物理化学
PdCu Membranes for Hydrogen Separation : Stability and Application Ranges
哥德巴赫; Yuan LX(袁立祥); Xu HY(徐恒泳)
Source PublicationPdCu Membranes for Hydrogen Separation : Stability and Application Ranges
Conference Name5th Forum on New Materials
Conference Date2010-6-13
2011
Conference Place托斯卡纳区
Pages18-0
Publisher待补充
Publication Place待补充
Cooperation Status分会口头报告
Department801
Funding OrganizationCIMTEC Conferences
AbstractPdCu 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.; 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.
Language英语
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/115927
Collection中国科学院大连化学物理研究所
Corresponding Author哥德巴赫
Recommended Citation
GB/T 7714
哥德巴赫,Yuan LX,Xu HY. PdCu Membranes for Hydrogen Separation : Stability and Application Ranges[C]. 待补充:待补充,2011:18-0.
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