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题名: Structure sensitive dissociation of CH4 on Ni/alpha-Al2O3: Ni nano-scale particles linearly compensate the E-a and ln A for the CH4 pulse kinetics
作者: Cui, YH;  Xu, HY;  Ge, QJ;  Wang, YZ;  Hou, SF;  Li, WZ
关键词: CH4 dissociation ;  Ni/alpha-Al2O3 ;  pulse kinetic ;  structure sensitive ;  compensation effect ;  Ni nano particle
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2006-04-18
DOI: 10.1016/j.molcata.2006.01.009
卷: 249, 期:1-2, 页:53-59
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 intrinsic kinetic information for the dissociation of CH4 on the fresh Ni active sites was studied by pulsing CH4 through Ni/alpha-Al2O3 catalyst with different Ni particles. After the elimination of the mass and heat transfer, the conversions of CH4 were controlled far below the values of the thermodynamic equilibrium in order to keep the pulse reaction in the kinetic region. The coverage degree of carbon species on Ni active site is kept less than 1 to eliminate the influence of carbon deposition on the dissociation of CH4. The plot of TOFCH4 versus the Ni particle size exhibits a "mountain" shape. The Ea and In A for the CH4 dissociation are linearly increased with the increase in the Ni particle size, showing the compensation effect in the CH4 dissociation. This work reveals that the CH4 dissociation on fresh Ni active site of Ni particles in Ni/alpha-Al2O3 catalysts is a structure sensitive reaction. (c) 2006 Elsevier B.V. All rights reserved.
关键词[WOS]: HETEROGENEOUS CATALYSIS ;  METHANE DECOMPOSITION ;  NICKEL-CATALYSTS ;  CARBON FORMATION ;  IN-SITU ;  HYDROGEN ;  CRACKING ;  NI(111) ;  METALS ;  SIZE
语种: 英语
WOS记录号: WOS:000237173500008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139992
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, Dalian 116023, Peoples R China

Recommended Citation:
Cui, YH,Xu, HY,Ge, QJ,et al. Structure sensitive dissociation of CH4 on Ni/alpha-Al2O3: Ni nano-scale particles linearly compensate the E-a and ln A for the CH4 pulse kinetics[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2006,249(1-2):53-59.
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