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题名: Structural and catalytic properties of supported Ni-Ir alloy catalysts for H-2 generation via hydrous hydrazine decomposition
作者: He, Lei1, 2;  Huang, Yanqiang1;  Liu, Xiao Yan1;  Li, Lin1;  Wang, Aiqin1;  Wang, Xiaodong1;  Mou, Chung-Yuan3;  Zhang, Tao1
关键词: Nickel-iridium alloy ;  Hydrazine ;  Hydrogen storage ;  EXAFS ;  Microcalorimeter
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2014-04-05
DOI: 10.1016/j.apcatb.2013.10.022
卷: 147, 页:779-788
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Iridium modified Ni/Al2O3 catalysts were prepared using Ni-Al hydrotalcite as precursor and tested in the selective decomposition of hydrous hydrazine for H-2 generation. Compared to Ni/Al2O3, NiIr/Al2O3 catalysts exhibited an increase of the reaction rate up to 6-fold and the H-2 selectivity from 93% to above 99%. The XRD and EXAFS analysis confirmed that Ir and Ni were present in the form of Ni-Ir alloy; and the H-2 differential heat of adsorption is appreciably lowered with increasing the amount of Ir in Ni-Ir alloy. High-temperature reduction, e.g. 700 degrees C, induced the migration of Ir atoms into the Ni bulk and produced a Ni-skin surface. This structural modification is associated with a strongly decrease of activity and selectivity. EXAFS measurements were also performed on different noble metals (NM, Ir, Pt, and Au) modified Ni/Al2O3 catalysts in order to verify the extent of NM-Ni bimetallic bond formation, which was found to correlate with the catalytic performance. (C) 2013 Elsevier B.V. All rights reserved.
关键词[WOS]: HIGHLY EFFICIENT CATALYST ;  BIMETALLIC CATALYSTS ;  ROOM-TEMPERATURE ;  SURFACE ALLOYS ;  1ST PRINCIPLES ;  STORAGE ;  NANOPARTICLES ;  SEGREGATION ;  REACTIVITY ;  CLUSTERS
语种: 英语
WOS记录号: WOS:000330489400084
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145541
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, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan

Recommended Citation:
He, Lei,Huang, Yanqiang,Liu, Xiao Yan,et al. Structural and catalytic properties of supported Ni-Ir alloy catalysts for H-2 generation via hydrous hydrazine decomposition[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2014,147:779-788.
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