Mengen lignite and Denizli peat and several lignite-peat blends were pyrolyzed in a thermobalance apparatus at atmospheric pressure. Experiments were carried out at nonisothermal conditions in the pyrolysis temperature interval of 293-1173 K under argon atmosphere at the heating rate value of 30 K/min. A decrease in both relative volatile matter yields and total conversion percentage of the sample with the increase in the blending ratio of lignite to peat was determined. Thermogravimetry (TG) and derivative thermogravimetry (DTG) data were analyzed by a first-order reaction rate model. Apparent activation energies of the lignite and peat were calculated as 32.42 kJ/mol and 52.09 kJ/mol, respectively. Effects of the peat weight percentage of the blends on kinetic parameters were investigated, and the results were discussed.