Reaction kinetics of reduction and oxidation of metal oxides for hydrogen production

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Partial oxidation of methane and water splitting for hydrogen production were carried out. The reaction kinetics of reduction and oxidation (redox) of Mn and Zn iron oxides were determined using a thermogravimetric analyzer. The reduction conversion of the metal oxides increases with temperature above 1073 K and all the experimental data are well represented by the diffusion-limited mechanism except ZnFe(2)O(4) due to the solid state diffusion of iron and the reaction with solid carbon. The oxidation reaction was also controlled by the product-layer diffusion mechanism. Substitution of Mn and Zn cations with iron oxides can lower the reaction temperature and increase the reaction rate. The reaction rate and the activation energy (57-110 kJ/mol) for decomposition of water by oxidation of the metal oxides were also determined. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2008-11
Language
English
Article Type
Article
Keywords

CHEMICAL-LOOPING COMBUSTION; OXYGEN CARRIER PARTICLES; HIGH-TEMPERATURE; H-2 GENERATION; PURE HYDROGEN; SYNTHESIS GAS; IRON-OXIDES; MECHANISM; METHANE; COPRODUCTION

Citation

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.33, no.21, pp.5986 - 5995

ISSN
0360-3199
DOI
10.1016/j.ijhydene.2008.05.039
URI
http://hdl.handle.net/10203/89788
Appears in Collection
CBE-Journal Papers(저널논문)
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