The activation energies and the pre-exponential factors increased with increasing EFB particle size for both pyrolysis and gasification stages ( Table 5). The experimental and modeled TGA and DTG curves for different particle sizes of EFB are presented in Fig. 5. Both the experimental and modeled curves for the EFB sample heated at three different heating rates showed a very good fit of the model to the experimental results. The standard deviation of less than 0.1% validates the good agreements between the experimental and the modeled values.