The Kinetics of Isothermal Hydrogen Reduction of Nanocrystalline Fe₂O₃ Powder

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  • Lee Geon-Yong
    Department of Metallurgy and Materials Science, Hanyang University
  • Choi Joon-Phil
    Department of Metallurgy and Materials Science, Hanyang University
  • Song Jun-Il
    Department of Metallurgy and Materials Science, Hanyang University
  • Jung Sung-Soo
    Department of Metallurgy and Materials Science, Hanyang University
  • Lee Jai-Sung
    Department of Metallurgy and Materials Science, Hanyang University

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  • The Kinetics of Isothermal Hydrogen Reduction of Nanocrystalline Fe<sub>2</sub>O<sub>3</sub> Powder

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The kinetics of reduction of nanocrystalline Fe2O3 powder with hydrogen was investigated in the temperature range from 573 K to 813 K. A comparison between the reduction rates of the nanocrystalline powder (20–50 nm) and those of the conventional powder (200–400 nm) showed no discernible difference despite a substantially larger specific surface area of the former. Since observations under the scanning electron microscope revealed that the nanocrystalline powder forms large agglomerates, the kinetic results were theoretically tested for the possibility that the reduction of the powder was inhibited by intra-agglomerate pore diffusion. Alternatively, a potential influence of water vapor remaining in the packed powder bed is discussed. Activation energies of 47.2 and 51.5 kJ/mol were obtained for the reduction of the nanocrystalline and the as-received powder, respectively. These values show fair agreement with those obtained by previous studies.

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 55 (10), 1611-1617, 2014

    公益社団法人 日本金属学会

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