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题名: Impact of mesoporous structure of acid-treated clay on nickel dispersion and carbon deposition for CO methanation
作者: Yang, Xuzhuang1;  Wendurima1;  Gao, Guanjun1;  Shi, Quanquan2;  Wang, Xin1;  Zhang, Jianan1;  Han, Chenhui1;  Wang, Jie1;  Lu, Huailiang1;  Liu, Jie1;  Tong, Min1
关键词: CO methanation ;  SNG ;  Macro-mesoporous material ;  Montmorillonite
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2014-02-25
DOI: 10.1016/j.ijhydene.2013.12.044
卷: 39, 期:7, 页:3231-3242
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: Nickel catalysts supported on different acid-treated clays were prepared by the impregnation method in order to investigate the effect of the pore structures of supports on the dispersion and the chemical states of nickel species, and thus on the carbon depositions resulted from the dissociation of the CO molecules adsorbed on different active nickel sites. The catalysts and supports were characterized by the X-ray diffraction (XRD), the transmittance electron microscopy (TEM), the H-2 temperature-programmed reduction (H-2-TPR), the nitrogen adsorption-desorption, and the thermogravimetry and differential thermal analysis (TG-DTA). The CO methanation performance of the catalyst was investigated at a temperature range from 300 degrees C to 500 degrees C. The results indicated that the dispersion and the states of the nickel species on the support were influenced strongly by the pore structures of the acid-treated clays, and only the mesopores composed by partly damaged clay layers were conducive to forming the active nickel species, and thus reducing the deposition of the inactive carbon and improving the stability of the catalyst. The carbon species deposited on different active sites was slightly different in the oxidative properties when it was oxidized in air. A fraction of aluminum in the clays was leached out by acid, which decreased the possibility of forming the spinel phase of nickel aluminate in the catalyst. The highly dispersed nickel species showed little relevance to the high activity of the catalyst, but it exhibited a strong relation to the nickel sites from the bulk nickel species. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: SUBSTITUTE NATURAL-GAS ;  SELECTIVE METHANATION ;  SYNGAS METHANATION ;  NI/AL2O3 CATALYSTS ;  METAL-CATALYSTS ;  DIOXIDE ;  MONOXIDE ;  NI/ZRO2 ;  BED
语种: 英语
WOS记录号: WOS:000331917400020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145406
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.Inner Mongolia Univ, Sch Chem & Chem Engn, Hohhot 010021, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Yang, Xuzhuang,Wendurima,Gao, Guanjun,et al. Impact of mesoporous structure of acid-treated clay on nickel dispersion and carbon deposition for CO methanation[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2014,39(7):3231-3242.
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