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NH3 decomposition kinetics on supported Ru clusters: Morphology and particle size effect
Zheng, Weiqing; Zhang, Jian; Xu, Hengyong; Li, Wenzhao
关键词Ammonia Decomposition Ru Kenitics Size Effects Compensation Effect
刊名CATALYSIS LETTERS
2007-12-01
DOI10.1007/s10562-007-9237-z
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
关键词[WOS]COX-FREE HYDROGEN ; FUEL-CELL APPLICATIONS ; CATALYTIC AMMONIA DECOMPOSITION ; STRUCTURE SENSITIVITY ; RUTHENIUM CATALYSTS ; CARBON ; GENERATION ; COMPENSATION ; POTASSIUM ; MECHANISM
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.
语种英语
WOS记录号WOS:000250996200018
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被引频次:45[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/140683
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Grad Sch, Dalian 116023, Peoples R China
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GB/T 7714
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.
APA Zheng, Weiqing,Zhang, Jian,Xu, Hengyong,&Li, Wenzhao.(2007).NH3 decomposition kinetics on supported Ru clusters: Morphology and particle size effect.CATALYSIS LETTERS,119(3-4),311-318.
MLA Zheng, Weiqing,et al."NH3 decomposition kinetics on supported Ru clusters: Morphology and particle size effect".CATALYSIS LETTERS 119.3-4(2007):311-318.
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