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

열화학 사이클 H2 제조를 위한 (Co0.5 Mn0.5)Fe2O4의 열적 거동

  • 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)
  • 신현창 (아주대학교 재료공학과) ;
  • 최승철 (아주대학교 재료공학과) ;
  • 김철성 (국민대학교 물리학과) ;
  • 김종원 (한국에너지기술연구원 수소에너지 연구센터) ;
  • 주오심 (한국과학기술연구원 나노환경센터) ;
  • 정광덕 (한국과학기술연구원 나노환경센터)
  • Published : 2002.06.15

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

Acknowledgement

Grant : 고효율수소제조기술개발 연구

Supported by : 과학기술부

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