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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Experimental Study on Thermochemical Water Splitting Hydrogen Production Using $MnO_2/Mn_2O_3$/NaOH System Added with $ZrO_2$

$ZrO_2$ 첨가 $MnO_2/Mn_2O_3$/NaOH 계를 이용한 열화학적 물분해 수소제조 실험 연구

  • Cha, Kwang-Seo (Department of Fine Chemical Engineering and Chemistry, Chungnam National University) ;
  • Ryu, Jae-Chun (Department of Fine Chemical Engineering and Chemistry, Chungnam National University) ;
  • Lee, Dong-Hee (Department of Fine Chemical Engineering and Chemistry, Chungnam National University) ;
  • Kim, Young-Ho (Department of Fine Chemical Engineering and Chemistry, Chungnam National University) ;
  • Park, Chu-Sik (Korea Institute of Energy Research) ;
  • Kim, Jong-Won (Korea Institute of Energy Research)
  • 차광서 (충남대학교 정밀공업화학과) ;
  • 류재춘 (충남대학교 정밀공업화학과) ;
  • 이동희 (충남대학교 정밀공업화학과) ;
  • 김영호 (충남대학교 정밀공업화학과) ;
  • 박주식 (한국에너지기술연구원) ;
  • 김종원 (한국에너지기술연구원)
  • Published : 2006.12.15
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Abstract

As one of the thermochemical water splitting hydrogen production cycles, which could be operated at the lower temperature below 1200 K, we investigated the feasibility of the cyclic operation of Ispra Mark 2 cycle with the addition of $ZrO_2$. The cycle is theoretically composed of three reaction steps; (1) 1st step($2MnO_2{\rightarrow}Mn_2O_3+0.5O_2$), (2) 2nd step($Mn_2O_3+4NaOH{\rightarrow}2Na_2O{\cdot}MnO_2+H_2+H_2O$) and (3) 3rd step($2Na_2O{\cdot}MnO_2H_2O{\rightarrow}4NaOH+2MnO_2$). From the TPR tests, the temperature ranges for $O_2$ production in 1st step and $H_2$ production in 2nd step were $550{\sim}750^{\circ}C$ and $650{\sim}750^{\circ}C$, respectively. In $MnO_2/Mn_2O_3/NaOH$ system, the formation of molten products due to the reaction between manganese oxides and NaOH were greatly decreased with the addition of $ZrO_2$. In addition, the results of a cyclic test were discussed with the viewpoint of $H_2$ production amounts and the feasibility of the process improvement.

Keywords

References

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