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High-temperature stability of Pd alloy membranes containing Cu and Au
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
KeywordTernary Pd Alloy Membrane High-temperature Stability Alloy Segregation Pdcu Membrane Pdau Membrane
Source PublicationJOURNAL OF MEMBRANE SCIENCE
2017-12-15
DOI10.1016/j.memsci.2017.09.012
Volume544Pages:151-160
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
WOS SubjectEngineering, Chemical ; Polymer Science
WOS Research AreaEngineering ; Polymer Science
WOS KeywordPOROUS STAINLESS-STEEL ; SOLID-SOLUTION ALLOYS ; HYDROGEN SEPARATION ; COMPOSITE MEMBRANES ; PERMEATION CHARACTERISTICS ; INTERMETALLIC DIFFUSION ; THERMAL-STABILITY ; METAL MEMBRANES ; TERNARY ALLOY ; PALLADIUM
AbstractHigh-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.
Language英语
WOS IDWOS:000412350900017
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/150161
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Jia, Haiyuan.,Wu, Ping.,Zeng, Gaofeng.,Salas-Colerad, Eduardo.,Serranod, Aida.,...&Goldbach, Andreas.(2017).High-temperature stability of Pd alloy membranes containing Cu and Au.JOURNAL OF MEMBRANE SCIENCE,544,151-160.
MLA Jia, Haiyuan,et al."High-temperature stability of Pd alloy membranes containing Cu and Au".JOURNAL OF MEMBRANE SCIENCE 544(2017):151-160.
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