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Study of n value and alpha/beta palladium hydride phase transition within the ultra-thin palladium composite membrane
Li, Hui; Xu, Hengyong; Li, Wenzhao
关键词h(2) Permeation n Value Surface Process Alpha -> Beta Palladium Hydride Phase Transition Nanostructure
刊名JOURNAL OF MEMBRANE SCIENCE
2008-10-31
DOI10.1016/j.memsci.2008.06.053
324期:1-2页:44-49
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
关键词[WOS]HYDROGEN PERMEATION BEHAVIOR ; PD MEMBRANES ; SEPARATION ; ABSORPTION ; PERMEABILITY ; RESISTANCE ; TRANSPORT ; SUPPORT ; LAYERS
英文摘要The gas permeation of a 2 mu m thick Pd membrane was examined between 363 K and 773 K with p(feed) ranging from 1.4 bar to 3.8 bar and p(perm) fixed at atmospheric pressure. The pressure exponent value ranged from 0.68 to 1.0, and it gradually decreased with increasing temperature and pressure. The transformation of rate-limiting step and enhancement of surface process were suggested to the main reason for the fluctuation of n value, and the influence of contaminant species on the n value can be excluded in this study. The H(2) permeation flux of the membrane gave a marked change forming a peak at 413 K and 443 K with p(feed) = 2 bar and 3 bar, respectively. These two peaks can be ascribed to the alpha/beta palladium hydride phase transition. The metal membrane delaminated from the support after hydrogen embrittlement but it still maintained the nanostructure. The phase transition temperature range (20 K) for our 2 mu m thick membrane was smaller than that of a 25 mu m thick one (above 40 K) described in the literature. (C) 2008 Elsevier B.V. All rights reserved.
语种英语
WOS记录号WOS:000259792000005
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/141023
专题中国科学院大连化学物理研究所
作者单位Grad Univ Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
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GB/T 7714
Li, Hui,Xu, Hengyong,Li, Wenzhao. Study of n value and alpha/beta palladium hydride phase transition within the ultra-thin palladium composite membrane[J]. JOURNAL OF MEMBRANE SCIENCE,2008,324(1-2):44-49.
APA Li, Hui,Xu, Hengyong,&Li, Wenzhao.(2008).Study of n value and alpha/beta palladium hydride phase transition within the ultra-thin palladium composite membrane.JOURNAL OF MEMBRANE SCIENCE,324(1-2),44-49.
MLA Li, Hui,et al."Study of n value and alpha/beta palladium hydride phase transition within the ultra-thin palladium composite membrane".JOURNAL OF MEMBRANE SCIENCE 324.1-2(2008):44-49.
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