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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
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
2006-04-18
DOI10.1016/j.molcata.2006.01.009
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
关键词[WOS]HETEROGENEOUS CATALYSIS ; METHANE DECOMPOSITION ; NICKEL-CATALYSTS ; CARBON FORMATION ; IN-SITU ; HYDROGEN ; CRACKING ; NI(111) ; METALS ; SIZE
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.
语种英语
WOS记录号WOS:000237173500008
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被引频次:11[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/321008/139992
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, Dalian 116023, Peoples R China
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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.
APA Cui, YH,Xu, HY,Ge, QJ,Wang, YZ,Hou, SF,&Li, WZ.(2006).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.JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,249(1-2),53-59.
MLA Cui, YH,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".JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 249.1-2(2006):53-59.
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