ิhe combustion behavior and kinetics of various biomass chars is investigated and compared to a lignite and a hard coal char. Non-isothermal thermogravimetry experiments were performed in air atmosphere, over the temperature range of 25-850°C, at a heating rate of 10°C/min. Kinetic evaluation was performed using a power law model. Results showed that biomass chars exhibited smaller burnout times than lignite, while biomass reaction rates were higher. Reaction kinetic parameters were obtained by modeling the combustion of biomass and coal chars as a single reaction. Combustion of lignite and olive kernel was modelled by two partial reactions, indicating the heterogeneous nature of these chars. Reactivity was assessed using the specific reaction rate, as a function of conversion. Biomass chars were generally more reactive than those of hard coal and lignite.