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Reactive metal-oxide redox system for a two-step thermochemical conversion of coal and water to CO and H2

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  • Aoki, A.
  • Ohtake, H.
  • Shimizu, T.
  • Kitayama, Y.
  • Kodama, T.

Abstract

A number of metal-oxide redox systems were examined for a two-step thermochemical conversion of coal and water to CO and H2 for the purpose of utilizing solar high-temperature heat below 900°C: metal oxide+CHn (coal)→metal+CO+n/2H2, metal+H2O→metal oxide+H2. In2O3 and SnO2 were found to be the most reactive oxidants for coal under an N2 gas stream below 900°C. These reactive metal oxides were tested for the proposed two-step cyclic process in the pulse feeding mode of H2O, with a temperature swing and under an N2 gas stream. The two-step cyclic process using the In2O3/coal mixture could be repeated with high coal conversions of about 80% in the temperature range of 600–900°C by resupplying the consumed coal to the system. The repeated two-step process via the In2O3/In redox system resulted in efficient performance of the net reaction CHn (coal)+H2O→CO+(n/2+1)H2, while hydrogen was scarcely produced in the continuous feeding mode of H2O/N2 over the In2O3/coal mixture, at a constant temperature of 900°C. The separation of recovered In2O3 from the remaining coal ashes by In2O evaporation was also proposed.

Suggested Citation

  • Aoki, A. & Ohtake, H. & Shimizu, T. & Kitayama, Y. & Kodama, T., 2000. "Reactive metal-oxide redox system for a two-step thermochemical conversion of coal and water to CO and H2," Energy, Elsevier, vol. 25(3), pages 201-218.
    • Handle: RePEc:eee:energy:v:25:y:2000:i:3:p:201-218
    DOI: 10.1016/S0360-5442(99)00067-5
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    References listed on IDEAS

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    1. Tamaura, Y. & Wada, Y. & Yoshida, T. & Tsuji, M. & Ehrensberger, K. & Steinfeld, A., 1997. "The coal/Fe3O4 system for mixing of solar and fossil energies," Energy, Elsevier, vol. 22(2), pages 337-342.
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    5. Kodama, T. & Watanabe, Y. & Miura, S. & Sato, M. & Kitayama, Y., 1996. "Reactive and selective redox system of Ni(II)-ferrite for a two-step CO and H2 production cycle from carbon and water," Energy, Elsevier, vol. 21(12), pages 1147-1156.
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    1. Song, Lee-hwa & Kang, Hyun Woo & Park, Seung Bin, 2012. "Thermally stable iron based redox catalysts for the thermo-chemical hydrogen generation from water," Energy, Elsevier, vol. 42(1), pages 313-320.

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