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Studies on metal oxides suitable for enhancement of the O2-releasing step in water splitting by the MnFe2O4–Na2CO3 system

Author

Listed:
  • Kaneko, H
  • Hosokawa, Y
  • Kojima, N
  • Gokon, N
  • Hasegawa, N
  • Kitamura, M
  • Tamaura, Y

Abstract

Reactivities of three metal oxides (Fe2O3, TiO2 and MnO2) with Na2CO3, and of their reaction products with CO2, have been studied to enhance the O2-releasing step in the two-step water splitting by the MnFe2O4–Na2CO3 system. X-ray diffraction analysis and thermogravimetric measurements showed that the reaction of α-Fe2O3 with Na2CO3 (mole ratio=1:1) completed within 10 min at 1073 K to produce NaFeO2 (Fe2O3+Na2CO3→NaFeO2+CO2). Also, the regeneration of Fe2O3 and Na2CO3 proceeded readily by passing CO2 gas through NaFeO2 (71% yield). TiO2 reacted with Na2CO3 (mole ratio=1:1) at 1073 K for 1 h to form Na8Ti5O14 and Na2TiO3 (93% yield). However, in the reaction of the products with CO2, the starting material (TiO2) was not reproduced at the temperature range from 673 K to 1073 K, but Na4Ti5O12 (having a lower Na content than the form Na8Ti5O14) was formed. In the case of MnO2 with Na2CO3 (mole ratio=2:1), Na0.7MnO2–2.05 and NaMnO2 were produced at 1073 K for 1 h (80% yield), but the reaction between these products and CO2 hardly proceeded.

Suggested Citation

  • Kaneko, H & Hosokawa, Y & Kojima, N & Gokon, N & Hasegawa, N & Kitamura, M & Tamaura, Y, 2001. "Studies on metal oxides suitable for enhancement of the O2-releasing step in water splitting by the MnFe2O4–Na2CO3 system," Energy, Elsevier, vol. 26(10), pages 919-929.
    • Handle: RePEc:eee:energy:v:26:y:2001:i:10:p:919-929
    DOI: 10.1016/S0360-5442(01)00041-X
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    References listed on IDEAS

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    1. Tamaura, Y. & Steinfeld, A. & Kuhn, P. & Ehrensberger, K., 1995. "Production of solar hydrogen by a novel, 2-step, water-splitting thermochemical cycle," Energy, Elsevier, vol. 20(4), pages 325-330.
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