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题名: Studies on the decomposing carbon dioxide into carbon with oxygen-deficient magnetite II. The effects of properties of magnetite on activity of decomposition CO2 and mechanism of the reaction
作者: Zhang, CL;  Li, S;  Wang, LJ;  Wu, TH;  Peng, SY
关键词: decomposition of CO2 ;  magnetite ;  performance of reduction ;  absorption properties ;  mechanism of reaction ;  quasi-catalytic reaction ;  deactivation ;  activation by reduction
刊名: MATERIALS CHEMISTRY AND PHYSICS
发表日期: 2000-01-14
卷: 62, 期:1, 页:52-61
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Multidisciplinary
研究领域[WOS]: Materials Science
英文摘要: The properties of reduction and adsorption of magnetite were investigated using temperature programming technique and thermogravimetrical (TG) analysis, and the properties of magnetite were correlated with the activity of decomposing COP into carbon. The smaller the particle size of magnetite, the larger the surface area; and the lower the activated temperature by H-2 reduction, and the faster the activated speed (the speed of lost oxygen), the greater the amount of adsorption of O-2 and CO2, i.e., the higher the activity of decomposing CO2 is. There was specific rapid adsorption of CO2 an Fe3O3-delta (delta > 0), with oxygen deficiency and this adsorption accompanied with decomposing CO2 into carbon. Fe3O4-delta transfers its electron to the carbon in CO2 therefore, CO2 decomposes into carbon. Simultaneously, Fe3O4-delta, captures the oxygen in CO2 and converts itself into stoichiometric Fe3O4; so, Fe3O4-delta is deactivated. But Fe3O4-delta could be regenerated by activating Fe3O4 by H-2 reduction. The reaction of decomposing CO2 into carbon with magnetite belongs to quasi-catalytic reactions, and is equal to one-side reaction of the reversible process of the water gas shift reaction (WGS). Decomposition of CO2 into carbon on oxygen-deficient magnetite undergoes via two steps: CO2 --> CO + O2- and CO --> C + O, the former step is the control step of the reaction speed, and the intermediate product of CO is rapidly converted further into carbon. (C) 2000 Published by Elsevier Science S.A. All rights reserved.
关键词[WOS]: TEMPERATURE PROGRAMMED DESORPTION ;  CATION-EXCESS MAGNETITE ;  METAL-OXIDE CATALYSTS ;  COMPLETE REDUCTION
语种: 英语
WOS记录号: WOS:000084492100008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138807
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, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Jilin Univ, Dept Chem, Changchun 130023, Peoples R China
3.Chinese Acad Sci, Shanxi Inst Coal Chem, Taiyuan 030001, Peoples R China

Recommended Citation:
Zhang, CL,Li, S,Wang, LJ,et al. Studies on the decomposing carbon dioxide into carbon with oxygen-deficient magnetite II. The effects of properties of magnetite on activity of decomposition CO2 and mechanism of the reaction[J]. MATERIALS CHEMISTRY AND PHYSICS,2000,62(1):52-61.
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