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and orders of reaction under the aforementioned reaction atmospheres were calculated using the Friedman method (a differential 15 isoconversional approach) and the Ghetti method. In this work, the primary dominating factor on the rate of mass loss from 16 devolatilization was the higher heating rate (40°C/min), and the second factor was the higher oxygen concentration of 30%. 17Overlapping of devolatilization and char oxidation zones was also observed at higher oxygen concentrations of 30%. Increased 18 reactivity of the Pakistani lignite was observed at a heating rate of 40°C/min and high oxygen concentrations of 30%.