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题名: The CO2 reforming of CH4 over Ni/La2O3/alpha-Al2O3 catalysts: The effect of La2O3 contents on the kinetic performance
作者: Cui, Yuehua;  Zhang, Huidong;  Xu, Hengyong;  Li, Wenzhao
关键词: kinetics ;  reforming ;  CH4 ;  CO2 ;  Ni/La2O3/U-Al2O3
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2007
DOI: 10.1010/j.apcata.2007.06.039
卷: 331, 页:60-69
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: The aim of this work is to quantitatively investigate the effect of La2O3 contents on the intrinsic activity of Ni active sites for the CO2 reforming of CH4 on Ni/La2O3 (1, 2, 4, and 6 wt%)/alpha-Al2O3 Catalysts using steady and pulse kinetic methods. The Ni particle sizes were decreased with increasing La,03 contents. And the 4-La catalyst had the most Ni-H species. The Ni active sites on the 4-La catalyst showed the highest reforming activity and the lowest activation energy. Among CH4, CO2, CO, and H-2, only CH4 reaction orders were not zero and they were affected by the La2O3 contents. In 550-600 degrees C, the CH4 dissociation is a rate-determining step for the reforming reaction on the Ni/La2O3/alpha-Al2O3 catalysts. The 4-La catalyst gave the highest reforming activity because the CH4 dissociation was a structure sensitive reaction and 4-La catalyst has the most suitable Ni particle size. In 650-750 degrees C, the CH4 dissociation and the formation of Ni-H reached equilibration and the reaction between CHx species with La2O2CO3 became the rate-determining step. The 4-La catalyst with the most Ni-H could keep the highest x value of CHx intermediates, leading to the highest reforming activity in 650-750 degrees C. Therefore, the La2O3 contents on the catalysts tuned the Ni particle sizes and Ni-H amounts on the catalysts, which lead to higher reforming activity on the 4-La catalyst. (C) 2007 Elsevier B.V. All rights reserved.
关键词[WOS]: CARBON-DIOXIDE ;  SYNTHESIS GAS ;  NI/LA2O3 CATALYST ;  NICKEL-CATALYSTS ;  NI/AL2O3 CATALYSTS ;  NI CATALYSTS ;  METHANE ;  SYNGAS ;  NI/ALPHA-AL2O3 ;  TEMPERATURE
语种: 英语
WOS记录号: WOS:000250510100009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140671
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, Yuehua,Zhang, Huidong,Xu, Hengyong,et al. The CO2 reforming of CH4 over Ni/La2O3/alpha-Al2O3 catalysts: The effect of La2O3 contents on the kinetic performance[J]. APPLIED CATALYSIS A-GENERAL,2007,331:60-69.
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