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Titolo:
Reduction of carbon dioxide into carbon by the active wustite and the mechanism of the reaction
Autore:
Zhang, CL; Li, S; Wu, TH; Peng, SY;
Indirizzi:
Chinese6023, Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 11 Chinese Acad Sci Dalian Peoples R China 116023 Lab Catalysis, Dalian 11 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: 2, volume: 58, anno: 1999,
pagine: 139 - 145
SICI:
0254-0584(19990325)58:2<139:ROCDIC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATION-EXCESS MAGNETITE; DECOMPOSITION; FERRITE;
Keywords:
wustite; magnetite; reduction of carbon dioxide; carbon; eutectoid decomposition; Fe3C;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, CL ChineseDalianSci, Dalian Inst Chem Phys, State Key Lab Catalysis, POB 110, Chinese Acad Sci POB 110 Dalian Peoples R China 116023 POB 110,
Citazione:
C.L. Zhang et al., "Reduction of carbon dioxide into carbon by the active wustite and the mechanism of the reaction", MATER CH PH, 58(2), 1999, pp. 139-145

Abstract

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 at573 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 ofactive wustite into stoichiometric magnetite. The oxygen in CO2 is considered to be transferred to the surface of wustite in the form of O2- ions andthen these ions react with excess iron ions from the inside of the oxide to form the spinel structure. In order to maintain the electrical neutralityof 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 speedand 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 thereaction. During the reaction, the partial pressure of CO2 decreased gradually with increasing reaction time and finally the reaction system became avacuum. 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 14:14:53