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题名: Surface modification of Ni/Al2O3 with Pt: Highly efficient catalysts for H-2 generation via selective decomposition of hydrous hydrazine
作者: He, Lei1, 2;  Huang, Yanqiang1;  Wang, Aiqin1;  Liu, Yu1;  Liu, Xiaoyan1;  Chen, Xiaowei3;  Jose Delgado, Juan3;  Wang, Xiaodong1;  Zhang, Tao1
关键词: Hydrous hydrazine ;  Hydrogen storage ;  Pt-Ni alloy ;  EXAFS ;  TPD
刊名: JOURNAL OF CATALYSIS
发表日期: 2013-02-01
DOI: 10.1016/j.jcat.2012.10.012
卷: 298, 页:1-9
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, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Hydrous hydrazine, such as hydrazine monohydrate (N2H4 center dot H2O), is a promising hydrogen carrier material due to its high content of hydrogen (8.0 wt%). The decomposition of hydrous hydrazine to H-2 with a high selectivity and a high activity under mild conditions is the key to its potential usage as a hydrogen carrier material. Platinum-modified Ni/Al2O3 catalysts (NiPtx/Al2O3) were prepared starting from Ni-Al hydrotalcite and tested in the decomposition of hydrous hydrazine. Compared with Ni/Al2O3, the TOF was enhanced sevenfold over NiPt0.057/Al2O3; meanwhile, the selectivity to H-2 was increased to 98%. Characterization results by means of HAADF-STEM, XRD, and EXAFS revealed the presence of surface Pt-Ni alloy in this Pt-promoted catalyst. The formation of Pt-Ni alloy could significantly weaken the interaction between adspecies produced (including H-2 and NHx) and surface Ni atoms, which is confirmed by microcalorimetry and TPD results. The weakening effect could account for the greatly enhanced reaction rate, as well as H-2 selectivity on NiPtx/Al2O3 catalysts. (c) 2012 Elsevier Inc. All rights reserved.
关键词[WOS]: BIMETALLIC CATALYSTS ;  ROOM-TEMPERATURE ;  STORAGE ;  NI ;  ADSORPTION ;  NICKEL ;  DEHYDROGENATION ;  HYDROGENATION ;  METHANE ;  ALLOYS
语种: 英语
WOS记录号: WOS:000316155700001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137746
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 100039, Peoples R China
3.Univ Cadiz, Fac Ciencias, Dept Ciencia Mat & Ingn Met & Quim Inorgan, Cadiz, Spain

Recommended Citation:
He, Lei,Huang, Yanqiang,Wang, Aiqin,et al. Surface modification of Ni/Al2O3 with Pt: Highly efficient catalysts for H-2 generation via selective decomposition of hydrous hydrazine[J]. JOURNAL OF CATALYSIS,2013,298:1-9.
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