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Chemistry for Sustainable Development

2019 year, number 6

Kinetic Study of the Thermal Decomposition of Low-Ranked Coal of Mongolia and Tuva

O. YU. FETISOVA, P. N. KUZNETSOV, N. V. CHESNOKOV
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
Keywords: уголь, термическое разложение, дифференциальная термогравиметрия, кинетика, энергия активации, компенсационный эффект, coal, thermal decomposition, differential thermogravimetry, kinetics, activation energy, compensation effect
Pages: 677-684

Abstract

Thermal decomposition of brown coal from the Baganuur deposit in Mongolia and gas coal from the Ulug-Khem deposit in Tuva was studied using thermogravimetry (TG) and differential thermogravimetry (DTG). The stage-by-stage thermal decomposition was revealed under the conditions of programmed heating to 900 °C with different rates in the argon atmosphere. Using the model-free and isoconversion methods of Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunos (KAS), the dependence of the activation energy on the degree of coal decomposition was established, and the kinetic parameters of pyrolysis were determined. Within the range of coal conversion degrees from 0.1 to 0.9, the average values of pyrolysis activation energies for brown coal and gas coal were 186 and 239 kJ/mol (OFW method), 182 and 238 kJ/mol (KAS method), respectively. The kinetic compensation effect during coal pyrolysis was observed. This may be due to the multicomponent and multifunctional composition of coals.

DOI: 10.15372/CSD2019190