Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Two-step thermochemical cycle using metal oxide and CH4

금속산화물과 CH4를 이용한 2단계 열화학 사이클

  • Lee, S.H. (Dept. of Alternative Energy, Korea Institute of Energy Research) ;
  • Park, Y.C. (Dept. of Alternative Energy, Korea Institute of Energy Research) ;
  • Kim, J.W. (Dept. of Alternative Energy, Korea Institute of Energy Research) ;
  • Sim, K.S. (Dept. of Alternative Energy, Korea Institute of Energy Research) ;
  • Jung, K.D. (Korea Institute of Science & Technology)
  • 이상호 (한국에너지기술연구원 대체에너지연구부) ;
  • 박영철 (한국에너지기술연구원 대체에너지연구부) ;
  • 김종원 (한국에너지기술연구원 대체에너지연구부) ;
  • 심규성 (한국에너지기술연구원 대체에너지연구부) ;
  • 정광덕 (한국과학기술연구원)
  • Published : 2001.09.15
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Abstract

Hydrogen production by a 2-step water-splitting thermochemical cycle using metal oxides (ferrites) redox pairs and $CH_4$ have been studied in this experiment. The ferrites were reacted with $CH_4$ at $700{\sim}800^{\circ}C$ to produce CO, $H_2$ and various reduced phases (reduction step); these were then reoxidized with water vapor to generate $H_2$ in water-splitting step (oxidation step) at $600{\sim}700^{\circ}C$. The reduced ferrites, Ni-FeO and Ni-Fe alloy showed respectively different reactivity for $H_2$ formation from $H_2O$. In reduction reaction at $800^{\circ}C$, carbon was deposited on surface of Ni-ferrite due to $CH_4$ decomposition. This reduced phase containing carbon, which was taken quite different feature from other phase, produced $H_2$, CO, $CO_2$ by reacting with $H_2O$ at $600^{\circ}C$. The amount of $H_2$ evolved using reduced phase containing carbon was much higher than that of other phase.

Keywords

Acknowledgement

Grant : 고효율수소제조기술개발연구

Supported by : 과학기술부