A series of copper-free ternary oxide catalysts ZnAlCex used for hydrogen production via dimethyl ether steam reforming

	A series of copper-free ternary oxide catalysts ZnAlCex used for hydrogen production via dimethyl ether steam reforming
	Zhang, LJ; Meng, M; Wang, XJ; Zhou, S; Yang, LJ; Zhang, TY; Zheng, LR; Zhang, J; Hu, TD;郑黎荣; Zhang J(张静)
刊名	JOURNAL OF POWER SOURCES
	2014
卷号	268 页码:331-340
关键词	Dimethyl ether Steam reforming Hydrogen production Zinc-based catalyst
英文摘要	Ce-substituted ternary oxide catalysts ZnAlCex were prepared and employed in dimethyl ether steam reforming (DME SR) to produce hydrogen. XRD, XAFS (XANES & EXAFS), H2O-TPD, CH3OH-TPD and TPSR techniques were used for catalyst characterization. It is found that the catalytic performance of these catalysts is dependent on Ce content. The catalyst containing 20 wt% CeO2 exhibits the best catalytic performance. Its calculated TOF (0.034 s(-1)) is nearly three times to that of ZnAlO. The kinetic results reveal that the addition of 20 wt% CeO2 to ZnAlCex greatly decreases the apparent activation energy (Ea) of DME SR, due to the formation of new reaction sites such as Ce4+-O-Zn2+ linkages. XRD and EXAFS analyses indicate that Ce addition can not only decrease the crystallite size of ZnO and ZnAl2O4, but also tune the relative contents of them. The results of H2O-TPD and CH3OH-TPD show that Ce addition can lower H-2 desorption temperature, which accounts well for the better catalytic performance of ZnAlCex. It is worth noting that the Zn-based catalysts display much lower CO selectivity than the Cu-based one, especially the Ce-substituted ZnAlCex. Start-off durability tests demonstrate that this series of catalysts also possess high catalytic stability. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Electrochemistry; Energy & Fuels
收录类别	SCI
WOS记录号	WOS:000340311800043
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225155]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhang, LJ,Meng, M,Wang, XJ,et al. A series of copper-free ternary oxide catalysts ZnAlCex used for hydrogen production via dimethyl ether steam reforming[J]. JOURNAL OF POWER SOURCES,2014,268:331-340.
APA	Zhang, LJ.,Meng, M.,Wang, XJ.,Zhou, S.,Yang, LJ.,...&胡天斗.(2014).A series of copper-free ternary oxide catalysts ZnAlCex used for hydrogen production via dimethyl ether steam reforming.JOURNAL OF POWER SOURCES,268,331-340.
MLA	Zhang, LJ,et al."A series of copper-free ternary oxide catalysts ZnAlCex used for hydrogen production via dimethyl ether steam reforming".JOURNAL OF POWER SOURCES 268(2014):331-340.