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题名: Kinetic study of NH3 decomposition over Ni nanoparticles: The role of La promoter, structure sensitivity and compensation effect
作者: Zhang, J;  Xu, HY;  Li, WZ
关键词: reaction kinetics ;  ammonia decomposition ;  nano-sized nickel catalysts ;  lanthanum promotion ;  structure-sensitivity ;  compensation effect
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2005-12-12
DOI: 10.1016/j.apcata.2005.08.046
卷: 296, 期:2, 页:257-267
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: Some nickel nanoparticles supported on alumina were synthesized and tested for ammonia decomposition. Steady-state reaction kinetic results reveal that the turnover frequency (TOF) increases firstly with decreasing particle size, passes through a maximum in the range of mean size of Ni-0 1.8-2.9 nm and then decreases. A structure sensitivity of NH3 decomposition over Ni catalysts is strongly suggested. An excellent fit of experimental data by the Temkin-Pyzhev equation was obtained. A compensation effect between the pre-exponential factor (k(0)) and activation energy (Ea) was observed and quantified. Moreover, La could partially lower the particle size of Ni-0 and reduce the stability of reaction intermediates, which could be the main reason for its positive influence on the specific activity of Ni. H-2 temperature-programmed desorption (TPD) and NH3 temperature-programmed surface reaction (TPSR) were used as supplements to study the influence of Ni-0 particle size and addition of La on the catalytic behavior. (c) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: FUEL-CELL APPLICATIONS ;  CATALYTIC MEMBRANE REACTORS ;  AMMONIA DECOMPOSITION ;  RUTHENIUM CATALYSTS ;  HYDROGEN-PRODUCTION ;  ZEOLITE-X ;  PLATINUM ;  BARIUM ;  ACTIVATION ;  GENERATION
语种: 英语
WOS记录号: WOS:000234076500015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139826
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, Appl Catalysis Lab, Grad Sch, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, J,Xu, HY,Li, WZ. Kinetic study of NH3 decomposition over Ni nanoparticles: The role of La promoter, structure sensitivity and compensation effect[J]. APPLIED CATALYSIS A-GENERAL,2005,296(2):257-267.
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