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Thermal Behavior of (Co0.5 Mn0.5)Fe2O4 for Hydrogen Generation by Thermochemical Cycle  

Shin, H.C. (Department of Materials Science and Engineering, Ajou University)
Choi, S.C. (Department of Materials Science and Engineering, Ajou University)
Kim, C.S. (Department of Physics, Kookmin University)
Kim, J.W. (Hydrogen Research Center, Korea Institute of Energy Research)
Joo, O.S. (Eco-nano Research Center, Korea Institute Science and Technology)
Jung, K.D. (Eco-nano Research Center, Korea Institute Science and Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.2, 2002 , pp. 143-150 More about this Journal
Abstract
The thermal behavior of $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ prepared by a co-precipitation wasinvestigated for Hz generation by the thermochemical cycle. The reduction reaction of $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ started from $480^{\circ}C$, and the weight loss was 1.6 wt% up to $1100^{\circ}C$. At this reaction, $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ was reduced by release of oxygen bonded with the $Fe^{3+}$ ion in the B site of ($CO_{0.5}$ $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$. In the $H_2O$ decomposition reaction, $H_2$ was generated by oxidationof reduced $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$. The crystal structure of $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ for reduction reaction maintained spinel structure and the lattice constant of $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ ($8.41\AA$) was enlarged to $8.45\AA$. But the lattice constant of $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ after $H_2O$ decomposition reaction did not change to $8.45\AA$. Then, $(Co_{0.5}\;Mn_{0.5})Fe_2O_4$ is excellent material in the thermochemical cyclic reaction due to release oxygen at low temperature for the reduction reaction and produce $H_2$ maintaining crystal structure for redox reaction.
Keywords
Thermochemical cycle; Ferrite; M$\ddot O$ssbauer; Thermal behavior; Hydrogen production; Redox;
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