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题名: Effects of promoter La2O3 and supports on kinetic parameters of dissociation activation of CH4 over ni-based catalysts
作者: Cui Yuehua;  Xu Hengyong;  Ge Qingjie;  Wang Yuzhong;  Hou Shoufu;  Li Wenzhao
关键词: methane ;  dissociation ;  nickel-based catalyst ;  lanthana ;  activation energy ;  pre-exponential factor
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2006-06-01
卷: 27, 期:6, 页:479-484
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The influence of MgAl2O4 and alpha-Al2O3 supports, and La2O3 promoter on the CH4 dissociation was studied by pulsing CH4 over catalysts Ni/alpha-Al2O3 (A), Ni/La2O3/alpha-Al2O3 (A-L), Ni/MgAl2O4 (M), and Ni/La2O3/MgAl2O4 (M-L). In these unsteady pulse reactions, the carbon species coverage on the catalysts was kept less than 100% and the information about CH4 dissociation on the fresh Ni active sites was disclosed. Kinetic parameters for the CH4 dissociation over these catalysts were obtained under reaction conditions free from heat and mass transfer limitations. The CH4 dissociation activation energy (E.) on catalysts A, A-L, M, and M-L is 90.9, 111.8, 79.5, and 85.9 kJ/mol, respectively. The E-a values on catalysts M and M-L are lower than those on catalysts A and A-L. The La2O3 promoter increases the E. of CH4 dissociation. There is a compensation effect between the activation energy and the pre-exponential factor in the CH4 dissociation on the Ni-based catalysts, which reduces the influence of the supports and promoter on the CH4 dissociation.
关键词[WOS]: NICKEL-CATALYSTS ;  METHANE ;  CARBON ;  CO2 ;  MECHANISM ;  NI(111) ;  DECOMPOSITION ;  EXPLANATION ;  CRACKING ;  GROWTH
语种: 英语
WOS记录号: WOS:000239190800007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140050
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, Lab Nat Gas Utilizat & Appl Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Cui Yuehua,Xu Hengyong,Ge Qingjie,et al. Effects of promoter La2O3 and supports on kinetic parameters of dissociation activation of CH4 over ni-based catalysts[J]. CHINESE JOURNAL OF CATALYSIS,2006,27(6):479-484.
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