This work described results based on five iso-conversional methods used to investigate the kinetic triplets of Erythrina indica (EI) biomass pyrolysis by adopting thermogravimetric experimental data at four different heating rates. The kinetic plots generated by all the methods demonstrated a robust correlation with \(R^{2}\) values exceeding 0.98, signifying a high level of agreement. The average values of activation energy and pre-exponential factor were 176.861 \(-\) 184.787 \(\text{kJ mol}^{-1}\) and 2.680 × 1017 \(-\) 1.038 × 1022 \(\text{min}^{-1}\) , respectively. The determination of the reaction mechanisms was also carried out using the integral form of the master plot and Criado's master plot methods. Both methods revealed that the process involved a combination of various reaction models for the breakdown mechanisms of the constituents of feedstock. Additionally, thermodynamic feasibility of EI pyrolysis process was also carried out. The average values of change in enthalpy, change in Gibbs free energy and change in entropy spanned from 171.781 to 179.890 \(\text{kJ mol}^{-1}\) , 168.191–170.083 \(\text{kJ mol}^{-1}\) and 0.003–0.019 \(\text{kJ mol}^{-1} \text{K}^{-1}\) , respectively. In summary, the difference between activation energy and change in enthalpy of EI pyrolysis process was small; and individual thermodynamic properties, i.e., changes in enthalpy, changes in entropy and changes in Gibbs free energy, were positive. Thus, the pyrolysis of EI biomass is feasible only at high temperatures; however, the use of an appropriate catalyst may reduce the severity of feasibility temperature.
