Low-temperature stability of body-centered cubic PdCu membranes

	Low-temperature stability of body-centered cubic PdCu membranes
	Zhao, Chenyang 1,2; Goldbach, Andreas 2; Xu, Hengyong 2
刊名	JOURNAL OF MEMBRANE SCIENCE
	2017-11-15
卷号	542 页码:60-67
关键词	PdCu membranes Hydrogen separation Membrane stability Room temperature Electrodeposition
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.
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]	LAW PRESSURE EXPONENT ; HYDROGEN PERMEATION ; ALLOY MEMBRANES ; COMPOSITE MEMBRANES ; SEPARATION MEMBRANES ; NONIDEAL DIFFUSION ; COUPLED INFLUENCE ; PHASE-TRANSITION ; CU MEMBRANES ; PERMEABILITY
收录类别	SCI
语种	英语
WOS记录号	WOS:000410384300008
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/149872]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Zhongshan Rd 457, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Chenyang,Goldbach, Andreas,Xu, Hengyong. Low-temperature stability of body-centered cubic PdCu membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2017,542:60-67.
APA	Zhao, Chenyang,Goldbach, Andreas,&Xu, Hengyong.(2017).Low-temperature stability of body-centered cubic PdCu membranes.JOURNAL OF MEMBRANE SCIENCE,542,60-67.
MLA	Zhao, Chenyang,et al."Low-temperature stability of body-centered cubic PdCu membranes".JOURNAL OF MEMBRANE SCIENCE 542(2017):60-67.