The effect of co-existing nitrogen on hydrogen permeation through thin Pd composite membranes

	The effect of co-existing nitrogen on hydrogen permeation through thin Pd composite membranes
	Wang, Weiping; Pan, Xiulian; Zhang, Xiaoliang; Yang, Weishen; Xiong, Guoxing
刊名	separation and purification technology
	2007-04-01
卷号	54 期号:2 页码:262-271
关键词	Pd composite membrane hollow fiber hydrogen permeance nitrogen deactivation regeneration
通讯作者	熊国兴
产权排序	1;1
英文摘要	this study reports the poisoning effect of co-existing nitrogen on hydrogen permeation through pd composite membranes, consisting of thin pd layers supported on alpha-al2o3 hollow fibers. hydrogen permeation of the composite membranes was measured at temperatures of 623-773 k for pure gas permeation in sequence of hydrogen, nitrogen and hydrogen and for mixture gas separation of equimolar h-2/n-2. the composite membranes were defect-free and gave high hydrogen permeance of 31.2m(3)/m(2) h bar at 773 k. however, when the h-2 activated composite membranes were exposed to nitrogen for a certain time, the followed hydrogen permeance decreased in comparison with the original value. the degree of decrease increased with decreasing temperature and with exposure time. furthermore, when the composite membranes were exposed to the mixture feed of equimolar h2/n2 with certain total flow rate at temperatures of 673-723 k, the hydrogen flux on the permeate side kept stable only for several 100 min then decreased gradually to some extent. and significant reduction could be obtained during the followed pure hydrogen permeance test in comparison with the original value for the fresh membranes. fortunately, no additional defects were formed on the pd layers during these processes and the deactivations of the composite membranes were reversible. a certain-time hydrogen treatment at 773 k was sufficient to regenerate the deactivated membranes. the blocking of the active sites on pd surface for hydrogen diffusion by the formed nitrogen-containing species (nhx, x = 0-2) was responsible for the deactivation of the membranes in the suggested deactivation mechanism. (c) 2006 elsevier b.v. all rights reserved.
WOS标题词	science & technology ; technology
类目[WOS]	engineering, chemical
研究领域[WOS]	engineering
关键词[WOS]	palladium alloy membranes ; iron surfaces ; hollow fibers ; dehydrogenation ; h-2 ; permeability ; separation ; adsorption ; kinetics ; ammonia
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000246037400017
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/99421]
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	Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Wang, Weiping,Pan, Xiulian,Zhang, Xiaoliang,et al. The effect of co-existing nitrogen on hydrogen permeation through thin Pd composite membranes[J]. separation and purification technology,2007,54(2):262-271.
APA	Wang, Weiping,Pan, Xiulian,Zhang, Xiaoliang,Yang, Weishen,&Xiong, Guoxing.(2007).The effect of co-existing nitrogen on hydrogen permeation through thin Pd composite membranes.separation and purification technology,54(2),262-271.
MLA	Wang, Weiping,et al."The effect of co-existing nitrogen on hydrogen permeation through thin Pd composite membranes".separation and purification technology 54.2(2007):262-271.