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Thermogravimetric Study of the Kinetics of the Reaction C + CO 2 under Pore-Diffusion Control

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  • Igor Donskoy

    (Melentiev Energy Systems Institute of Siberian Branch of Russian Academy of Sciences, 130 Lermontova St., 664033 Irkutsk, Russia)

  • Aleksandr Kozlov

    (Melentiev Energy Systems Institute of Siberian Branch of Russian Academy of Sciences, 130 Lermontova St., 664033 Irkutsk, Russia)

Abstract

This study presents experimental studies of charcoal gasification with CO 2 at different heating rates (1, 5, 10, 20, and 50 K min −1 ). The kinetics of the reaction C + CO 2 under pore-diffusion control is studied. We propose a new method for the proper determination of activation energy during the processing of thermogravimetric curves of porous carbon gasification under conditions of pore-diffusion resistance. The results of the inverse kinetic problem solution are compared with different hypotheses about the regime of the investigated heterogeneous reaction process (kinetic, diffusion, pore-diffusion). The change of reaction regimes from kinetic to diffusion is detected during charcoal gasification at different heating rates. At heating rates of 5–20 K min −1 , the values of activation energy of carbon gasification reaction in the carbon dioxide atmosphere, obtained by the proposed method, closely match the data found in the previous studies. The use of diffusion models in the processing of thermogravimetric curves determines the conditions under which conventional kinetic models fail to provide adequate information about the temperature dependence of the heterogeneous reaction rate.

Suggested Citation

  • Igor Donskoy & Aleksandr Kozlov, 2021. "Thermogravimetric Study of the Kinetics of the Reaction C + CO 2 under Pore-Diffusion Control," Energies, MDPI, vol. 14(7), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1886-:d:526129
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    References listed on IDEAS

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    1. López-González, D. & Fernandez-Lopez, M. & Valverde, J.L. & Sanchez-Silva, L., 2014. "Gasification of lignocellulosic biomass char obtained from pyrolysis: Kinetic and evolved gas analyses," Energy, Elsevier, vol. 71(C), pages 456-467.
    2. Irfan, Muhammad F. & Usman, Muhammad R. & Kusakabe, K., 2011. "Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review," Energy, Elsevier, vol. 36(1), pages 12-40.
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