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On the relative rates of CO2—CO and H2O—H2 reactions with liquid silver at 1283 K and a liquid silicate at 1373 K

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Abstract

Measurements have been made of the steady-state oxygen activity in liquid silver at 1283 K in flowing CO2—H2 and H2O—CO gas mixtures. It is shown that the results are consistent with the consecutive reactions CO2 (g) → O (ad) + CO (g) and H2 (g) + O (ad) → H2O (g) as the rate determining steps under the limiting conditions of low coverage by adsorbed oxygen. Measurements of the steady-state oxygen activity in two iron oxide-containing lithium silicates under flowing CO2-H2 gas mixtures at 1373 K are in agreement with a similar mechanism. The study indicates that the rate of dissociation of H2O is about 4.6 times higher than the rate of dissociation of CO2 on the liquid silver surface at 1283 K and about 2.1 times higher on the lithium silicate surface at 1373 K. From the present and previous work, it appears that the ratio of the rates of dissociation of H2O and CO2 at high temperatures is not strongly influenced by the nature of the reaction surface, despite significant differences in absolute reaction rates.

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Authors and Affiliations

  1. Department of Metallurgy, University of Newcastle, NSW, Australia

    Y. Sasaki (Postdoctoral Research Fellow)

  2. Central Research Laboratories, The Broken Hill Proprietary Company,Ltd., Shortland, NSW, Australia

    Y. Sasaki (Postdoctoral Research Fellow)

  3. Department of Metallurgy, University of Newcastle, NSW, Australia

    G. R. Belton (Director, Honorary Professor, Adjunct Professor)

  4. Department of Materials Science and Engineering, University of Pennsylvania, 19104, Philadelphia, PA

    G. R. Belton (Director, Honorary Professor, Adjunct Professor)

Authors
  1. Y. Sasaki
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  2. G. R. Belton
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Sasaki, Y., Belton, G.R. On the relative rates of CO2—CO and H2O—H2 reactions with liquid silver at 1283 K and a liquid silicate at 1373 K. Metall Trans B 14, 267–272 (1983). https://doi.org/10.1007/BF02661023

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  • DOI: https://doi.org/10.1007/BF02661023

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