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题名: Compensation Effect in H-2 Permeation Kinetics of PdAg Membranes
作者: Zeng, Gaofeng1;  Goldbach, Andreas1;  Shi, Lei1;  Xu, Hengyong1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2012-08-30
DOI: 10.1021/jp305771h
卷: 116, 期:34, 页:18101-18107
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Knowledge about the (inter)dependence of permeation kinetic parameters on the stoichiometry of H-2- selective alloys is still rudimentary, although uncovering the underlying systematic correlations will greatly facilitate current efforts into the design of novel high-performance H-2 separation membranes. Permeation measurements with carefully engineered, 2-7 mu m thick supported Pd100-xAgx membranes reveal that the activation energy and pre-exponential factor of H-2 permeation laws vary systematically with alloy composition, and both kinetic parameters are strongly correlated for x <= 50. We show that this permeation kinetic compensation effect corresponds well with similar correlations in the hydrogen solution thermodynamics and diffusion kinetics of PdAg alloys that govern H-2 permeation rates. This effect enables the consistent description of permeation characteristics over wide temperature and alloy stoichiometry ranges, whereas hydrogen solution thermodynamics may play a role, too, as a yet unrecognized source of kinetic compensation in, for example, H-2-involving reactions over metal catalysts or hydrogenation/dehydrogenation of hydrogen storage materials.
关键词[WOS]: PALLADIUM-SILVER MEMBRANES ;  LOW-TEMPERATURE H-2 ;  MATHEMATICAL ORIGINS ;  HYDROGEN-PRODUCTION ;  COMPOSITE MEMBRANE ;  AG MEMBRANES ;  ALLOYS ;  DIFFUSION ;  THERMODYNAMICS ;  PERMEABILITY
语种: 英语
WOS记录号: WOS:000308120000014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143000
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

Recommended Citation:
Zeng, Gaofeng,Goldbach, Andreas,Shi, Lei,et al. Compensation Effect in H-2 Permeation Kinetics of PdAg Membranes[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2012,116(34):18101-18107.
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