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题名: Study of n value and alpha/beta palladium hydride phase transition within the ultra-thin palladium composite membrane
作者: Li, Hui1;  Xu, Hengyong1;  Li, Wenzhao1
关键词: H(2) permeation ;  n value ;  surface process ;  alpha -> beta palladium hydride phase transition ;  nanostructure
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2008-10-31
DOI: 10.1016/j.memsci.2008.06.053
卷: 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
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.
关键词[WOS]: HYDROGEN PERMEATION BEHAVIOR ;  PD MEMBRANES ;  SEPARATION ;  ABSORPTION ;  PERMEABILITY ;  RESISTANCE ;  TRANSPORT ;  SUPPORT ;  LAYERS
语种: 英语
WOS记录号: WOS:000259792000005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141023
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.Grad Univ Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
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.
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