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题名: Low-temperature stability of body-centered cubic PdCu membranes
作者: Zhao, Chenyang1, 2;  Goldbach, Andreas1;  Xu, Hengyong1
关键词: PdCu membranes ;  Hydrogen separation ;  Membrane stability ;  Room temperature ;  Electrodeposition
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2017-11-15
DOI: 10.1016/j.memsci.2017.07.049
卷: 542, 页:60-67
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: Concerns about limited durability at ambient temperatures are a major obstacle for the utilization of Pd-type membranes for H-2 purification in local, on-demand H-2 production. It is clear that pure Pd membranes are not suitable for applications that involve fast regular start-up and shut-down of purification systems but knowledge remains sparse about the performance of Pd alloy membranes in such situations. Here we investigated the stability of thin-layered, supported PdCu membranes with body-centered cubic (bcc) structure between room temperature and 673 K at H-2 pressure differences Delta P-H2 up to 1 MPa. Three PdCu layers with 46-50% Pd have been prepared by alternating electrodeposition of multiple Cu and Pd layers onto metallized ceramic membranes and subsequent alloying at 673-773 K. The H-2 permeation rates of all membranes can be described by single permeation laws in the entire investigated temperature range. The nominal H-2 permeability of a Pd48Cu52 membrane amounted to 2.3 x 10(-9) mol m(-1) s(-1) Pa-0.5 at 673 K and Delta P-H2 = 100 kPa with an ideal H-2/N-2 selectivity of 3382. The H-2 fluxes and N-2 leak rates of the three membranes were not affected by cycling between room temperature and 673 K under up to 1.1 MPa H-2 which included more than a dozen H-2/N-2 exchanges at 298 K. These fluxes remained also stable through 100 h continuous operation in H-2 at that temperature. The excellent low-temperature tolerance of these membranes is attributed to the marginal hydrogen solubility in bcc PdCu alloys rendering them promising membrane materials for H-2 purification involving everyday operation at ambient temperatures.
关键词[WOS]: LAW PRESSURE EXPONENT ;  HYDROGEN PERMEATION ;  ALLOY MEMBRANES ;  COMPOSITE MEMBRANES ;  SEPARATION MEMBRANES ;  NONIDEAL DIFFUSION ;  COUPLED INFLUENCE ;  PHASE-TRANSITION ;  CU MEMBRANES ;  PERMEABILITY
语种: 英语
WOS记录号: WOS:000410384300008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149872
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, Zhongshan Rd 457, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Zhao, Chenyang,Goldbach, Andreas,Xu, Hengyong. Low-temperature stability of body-centered cubic PdCu membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2017,542:60-67.
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