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The work investigates the thermal degradation characteristics, kinetics, and thermodynamics of low-rank coals of three different grades selected from coal mines of Odisha, India by thermogravimetric analysis in temperatures ranging from 30°C to 1000°C under a nitrogen atmosphere at five heating rates of 5, 10, 15, 20, and 25°C min −1 . The kinetic parameters are computed using model-fitting methods assuming first-order kinetics in the 250–635°C temperature range of major weight loss. The average activation energy of the reaction at different heating rates is found to be in the range of 55–65 kJ/mol. The average entropy change is found to vary from −180.03 to −165.887 J/K/mol 1 , the average enthalpy change varies from 51.1758 to 57.574 kJ/mol and that of free energy change varies from 189.718 to 177.9 kJ/mol. In addition, the composition of the oil obtained by pyrolysis of the coal in a semi-batch reactor at different temperatures is analyzed by FTIR and GC-MS techniques. The composition of the oil is found to be affected by the pyrolysis temperature.

Effect of coal grade and heating rate on the thermal degradation behavior, kinetics, and thermodynamics of pyrolysis of low-rank coal