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题名: NH3 decomposition kinetics on supported Ru clusters: Morphology and particle size effect
作者: Zheng, Weiqing;  Zhang, Jian;  Xu, Hengyong;  Li, Wenzhao
关键词: ammonia decomposition ;  Ru ;  kenitics ;  size effects ;  compensation effect
刊名: CATALYSIS LETTERS
发表日期: 2007-12-01
DOI: 10.1007/s10562-007-9237-z
卷: 119, 期:3-4, 页:311-318
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The supported Ru clusters with mean sizes ranging from 1.9 to 4.6 nm showed a high activity towards the NH3 decomposition reaction. The structural properties of catalysts were characterized by N-2 adsorption/desorption, X-ray diffraction (XRD) and transmission electron micrograph (TEM). Steady-state reaction kinetics revealed that the apparent activation energy increased with a decrease in Ru particle size and ranged from 79 kJ mol(-1) to 122 kJ mol(-1). The decomposition rate over Ru nanoparticles showed a strong dependency on mean crystallite size and the optimum appeared at d(Ru) = 2.2 nm. The dependencies of reaction rate on partial pressures of NH3 and H-2 were also sensitive to the varying Ru particle size. Experimental data could be well fitted by the Temkin-Pyzhev equation, indicating that the recombinative desorption of surface nitrogen atom acts as the rate-determining step. A compensation effect between the pre-exponential factor (k(0)) and activation energy (E-a ) was quantified.
关键词[WOS]: COX-FREE HYDROGEN ;  FUEL-CELL APPLICATIONS ;  CATALYTIC AMMONIA DECOMPOSITION ;  STRUCTURE SENSITIVITY ;  RUTHENIUM CATALYSTS ;  CARBON ;  GENERATION ;  COMPENSATION ;  POTASSIUM ;  MECHANISM
语种: 英语
WOS记录号: WOS:000250996200018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140683
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, Grad Sch, Dalian 116023, Peoples R China

Recommended Citation:
Zheng, Weiqing,Zhang, Jian,Xu, Hengyong,et al. NH3 decomposition kinetics on supported Ru clusters: Morphology and particle size effect[J]. CATALYSIS LETTERS,2007,119(3-4):311-318.
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