Thermogravimetric assessment and multi-model kinetic study of Indian fish tail nut biomass

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发表日期：

2025年9月9日

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Rakhesh Indira Pachamaanickam,
Shenbaga Vinayaga Moorthi Navaneethakrishnan

摘要

Abstract

This study pioneered thermogravimetric and differential thermal analysis of Indian fish tail nut biomass (IFTNB) using five isoconversional kinetic models and thermodynamic parameter evaluation. The comprehensive approach reveals the pyrolysis behaviour of this underutilised biomass, which could be used in renewable energy systems. The activation energy of IFTNB (kJ mol⁻¹) is 11.62 (Friedman model), 130.19 (Kissinger kinetic model), 64.85 (FWO model), 55.45 (KAS model), and 68.10 (Vyazovkin model), demonstrating the assumptions’ impact on thermal decomposition study. Decomposition stages are more reliable using the Vyazovkin model (68.10 kJ mol⁻¹). IFTNB’s Friedman model has the lowest enthalpy (ΔH_α = 7.07 kJ mol⁻¹) and entropy (ΔS_α = 0.1868 kJ mol⁻¹ K⁻¹), whereas FWO and KAS models have moderate values (60.44 and 51.03 kJ mol⁻¹) and ΔSα (0.2839 and 0.2658 kJ mol⁻¹ K⁻¹). According to the Vyazovkin model, ΔH_α (63.69 kJ mol⁻¹) and ΔS_α (0.3082 kJ mol⁻¹ K⁻¹) are greater, but Kissinger kinetic model has the highest values (123.57 kJ mol⁻¹ and 0.3313 kJ mol⁻¹ K⁻¹). Gibbs free energy (ΔG_α) is steady at -91.87 kJ mol⁻¹ for most procedures, except Kissinger, which has a lower ΔG_α (-140.30 kJ mol⁻¹) indicating a more spontaneous reaction This study showed that biomass has several bioenergy applications, especially in high-temperature processes.

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