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学科主题: 物理化学
题名: Hydrogen-induced high-temperature segregation in palladium silver membranes
作者: Zeng, Gaofeng1, 2;  Jia, Haiyuan1;  Goldbach, Andreas1;  Zhao, Lingfang1;  Miao, Shu1;  Shi, Lei1, 3;  Sun, Chenglin1;  Xu, Hengyong1
通讯作者: AndreasGoldbach ;  徐恒泳
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2014
DOI: 10.1039/c4cp03245d
卷: 16, 期:46, 页:25330-25336
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Higher operation temperatures benefit H-2 permeability and selectivity of metal membranes and they are interesting for e.g. water gas shift and steam reforming in membrane reactors. Hence the behaviour of PdAg-ceramic composite membranes has been investigated between 823 K and 923 K. The H-2 flux of membranes with less than 10 mu m thick alloy layers decreased continuously with time during operation under H-2 at 873 K and above. This was accompanied by a steady increase of the activation energy for H-2 permeation and the growth of Ag-depleted crystallites on the membrane surface. All phenomena could be reversed through annealing under N-2 at 923 K. The textural and permeability changes are consistent with a segregation mechanism starting with metal sublimation from hydrogenated PdAg layers and subsequent metal resublimation. This implies an enhancement of the yet unknown metal activities in PdAg hydride phases over metallic PdAg alloys. Ramifications for application of thin-layered, supported PdAg membranes for H-2 separation above 823 K are discussed.
关键词[WOS]: AG ALLOY MEMBRANES ;  SURFACE SEGREGATION ;  THERMAL-STABILITY ;  PD ;  SEPARATION ;  PERMEATION ;  DIFFUSION ;  ADSORPTION ;  KINETICS ;  REACTORS
语种: 英语
WOS记录号: WOS:000344989500017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143852
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.Chinese Acad Sci, Shanghai Adv Res Inst, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China
3.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

Recommended Citation:
Zeng, Gaofeng,Jia, Haiyuan,Goldbach, Andreas,et al. Hydrogen-induced high-temperature segregation in palladium silver membranes[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2014,16(46):25330-25336.
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