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题名: Reduction of carbon dioxide into carbon by the active wustite and the mechanism of the reaction
作者: Zhang, CL;  Li, S;  Wu, TH;  Peng, SY
关键词: wustite ;  magnetite ;  reduction of carbon dioxide ;  carbon ;  eutectoid decomposition ;  Fe3C
刊名: MATERIALS CHEMISTRY AND PHYSICS
发表日期: 1999-03-25
卷: 58, 期:2, 页:139-145
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: Normal wustite (Fe0.94O) was prepared by rapidly decomposing ferrous oxalate in vacuum at 923 K. Normal wustite, which was kept in a He atmosphere at 573 K for 10 min, undergoes eutectoid decomposition into active wustite (Fe0.98O) and stoichiometric magnetite. Compared with normal wustite, active wustite is more unstable and it is active for decomposing carbon dioxide. Carbon dioxide (1.013 x 10(5) Pa) was almost completely reduced into carbon by active wustite at 573 K, which was associated with the transformation of active wustite into stoichiometric magnetite. The oxygen in CO2 is considered to be transferred to the surface of wustite in the form of O2- ions and then these ions react with excess iron ions from the inside of the oxide to form the spinel structure. In order to maintain the electrical neutrality of the oxide, active wustite releases electrons, which will move to the surface and be donated to the carbon in CO2; therefore the carbon is reduced. The reduction of CO2 into carbon is undergone via two steps: CO2 --> CO --> C, the former step, CO2 --> CO, is the control step of the reaction speed and CO is the intermediate of this reaction, because the speed of CO conversion is faster than that of CO2 when CO was produced in the process of the reaction. During the reaction, the partial pressure of CO2 decreased gradually with increasing reaction time and finally the reaction system became a vacuum. Elevating reaction temperature, the speed of CO2 decomposition increased and the content of CO produced in the reaction process decreased. (C) 1999 Elsevier Science S.A. All rights reserved.
关键词[WOS]: CATION-EXCESS MAGNETITE ;  DECOMPOSITION ;  FERRITE
语种: 英语
WOS记录号: WOS:000079386300007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138204
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,Wu, TH,et al. Reduction of carbon dioxide into carbon by the active wustite and the mechanism of the reaction[J]. MATERIALS CHEMISTRY AND PHYSICS,1999,58(2):139-145.
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