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Titolo:
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
Autore:
Zhang, CL; Li, S; Wang, LJ; Wu, TH; Peng, SY;
Indirizzi:
Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China Chinese Acad Sci Dalian Peoples R China 116023 n 116023, Peoples R China Jilin Univ, Dept Chem, Changchun 130023, Peoples R China Jilin Univ Changchun Peoples R China 130023 chun 130023, Peoples R China Chinese Acad Sci, Shanxi Inst Coal Chem, Taiyuan 030001, Peoples R China Chinese Acad Sci Taiyuan Peoples R China 030001 030001, Peoples R China
Titolo Testata:
MATERIALS CHEMISTRY AND PHYSICS
fascicolo: 1, volume: 62, anno: 2000,
pagine: 52 - 61
SICI:
0254-0584(20000114)62:1<52:SOTDCD>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE PROGRAMMED DESORPTION; CATION-EXCESS MAGNETITE; METAL-OXIDE CATALYSTS; COMPLETE REDUCTION;
Keywords:
decomposition of CO2; magnetite; performance of reduction; absorption properties; mechanism of reaction; quasi-catalytic reaction; deactivation; activation by reduction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, CL Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, POB 110,Dalian 116023, Peoples R China Chinese Acad Sci POB 110 Dalian Peoples R China 116023 R China
Citazione:
C.L. Zhang 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", MATER CH PH, 62(1), 2000, pp. 52-61

Abstract

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 magnetiteundergoes 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.

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Documento generato il 31/03/20 alle ore 09:37:08