Effect of CO 2 Pressure on the Reaction with CaO

Authors

  • WENDELL G. OAKESON,

    1. Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
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    • *

      Now with United States Steel Corp. Geneva Works, Provo, Utah 84601.

  • IVAN B. CUTLER

    1. Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
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    • Member. the American Ceramic Society.

    • Deceased September 1979.


  • Supported by the National Science Foundation under Grant No. DMR 75-02893.

Abstract

The effect of temperature and CO2 pressure on the kinetics of the reaction CaO + CO2°CaCO3 was studied. The reaction rapidly becomes diffusion-controlled as CaCO3 builds up on the surface of CaO. The pressure dependence of the diffusion-controlled reaction approximated that expected for a Langmuir adsorption isotherm. Temperature affected the extent of CO2 adsorption through θ, the fraction of surface sites covered, as well as the diffusion coefficient, D. The relation Rate =θKD describes the reaction where K is a constant containing geometrical factors, etc. The diffusion activation energy equals 29±6 kcal/mol.

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