A Kinetic Study of the Stepwise Thermal Decomposition of Various Coals from Mongolia

Abstract

The thermolysis of Mongolian coals of different ranks was studied using thermal analysis (TG/DTG). The stepwise decomposition under conditions of programmed heating to 1000°C in an atmosphere of argon was found. The kinetic parameters of pyrolysis were determined based on thermogravimetric analysis with the use of model-fitting (Coats–Redfern) and model-free (Ozawa–Flynn–Wall) calculation methods. Changes in the activation energy with the degree of decomposition of the organic matter of coals of different ranks were established. A kinetic compensation effect was revealed, which was, probably due to the multicomponent composition of coals.

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Funding

This work was supported by the Russian Foundation for Basic Research (grant no. 19-53-44001) and the Mongolian Science and Technology Foundation (grant no. ShUGKh/OKhU/-2019/13) and carried out within the framework of a state contract at the Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences (project no. AAAA-A17-117021310220-0) using the equipment of the Krasnoyarsk Regional Center of Collective Use of the Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences and at the Institute of Chemistry and Chemical Technology of the Mongolian Academy of Sciences.

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Correspondence to O. Yu. Fetisova or P. N. Kuznetsov or B. Purevsuren or B. Avid.

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Translated by V. Makhlyarchuk

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Fetisova, O.Y., Kuznetsov, P.N., Purevsuren, B. et al. A Kinetic Study of the Stepwise Thermal Decomposition of Various Coals from Mongolia. Solid Fuel Chem. 55, 1–7 (2021). https://doi.org/10.3103/S0361521921010031

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Keywords:

  • coal
  • thermal decomposition
  • differential thermogravimetry
  • kinetics
  • activation energy
  • compensation effect