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题名: High-temperature stability of Pd alloy membranes containing Cu and Au
作者: Jia, Haiyuan1, 2;  Wu, Ping3;  Zeng, Gaofeng3;  Salas-Colerad, Eduardo4, 5;  Serranod, Aida4, 5;  Castrod, German R.4, 5;  Xu, Hengyong1;  Sun, Chenglin1;  Goldbach, Andreas1
关键词: Ternary Pd alloy membrane ;  High-temperature stability ;  Alloy segregation ;  PdCu membrane ;  PdAu membrane
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2017-12-15
DOI: 10.1016/j.memsci.2017.09.012
卷: 544, 页:151-160
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: High-temperature stability of Pd-based membranes benefits their application in steam reformers and sulfur-contaminated H-2 streams because both membrane reforming efficiency and sulfur tolerance of Pd alloys increase much with temperature. Hence, we investigated PdCu, PdAu, and PdCuAu membranes supported on porous ceramic tubes between 500 degrees C and 650 degrees C. Remarkably, PdCu membranes were much more stable than Au-containing ones. The H-2 permeation rates of some PdAu and PdCuAu membranes declined at 550 degrees C with substantially increasing N-2 fluxes. This was triggered by severe morphological deformation of the Au alloy films into stoichiometrically inhomogeneous, cavernous structures. The H-2 fluxes of the PdCu membranes started to decline at 650 degrees C with leak flows increasing slightly. Moreover, the PdCu layer morphology remained dense and compositionally homogeneous even after testing for up to 4800 h between 500 and 650 degrees C. The strikingly different high-temperature stability can be understood by considering the divergent surface segregation tendencies of Cu and Au and their differing impact on hydrogen solubility in Pd alloys. As a result, Au may desorb much more easily from membranes than Cu leading to structural instability above 500 degrees C during operation in H-2. The instability of PdAu membranes at high temperatures may be mitigated by addition of sufficient Cu to obtain ternary membranes with good H-2 permeability and better thermal stability.
关键词[WOS]: POROUS STAINLESS-STEEL ;  SOLID-SOLUTION ALLOYS ;  HYDROGEN SEPARATION ;  COMPOSITE MEMBRANES ;  PERMEATION CHARACTERISTICS ;  INTERMETALLIC DIFFUSION ;  THERMAL-STABILITY ;  METAL MEMBRANES ;  TERNARY ALLOY ;  PALLADIUM
语种: 英语
WOS记录号: WOS:000412350900017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150161
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China
4.ESRF European Synchrotron, Spanish CRG Beamline BM25, SpLine, 71 Ave Martyrs, F-38000 Grenoble, France
5.CSIC, ICMM, E-28049 Canto Blanco, Spain

Recommended Citation:
Jia, Haiyuan,Wu, Ping,Zeng, Gaofeng,et al. High-temperature stability of Pd alloy membranes containing Cu and Au[J]. JOURNAL OF MEMBRANE SCIENCE,2017,544:151-160.
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