Combined isoconversional analysis and modified empirical kinetic mechanism function for characterizing the kinetics of tobacco waste pyrolysis

Yixuan Wang, Xinyue Jia, Zhan Zhang, Chong Li, Wenzhao Liu, Lu Han, Xuebin Zhao, Lili Fu, Jian Zhou, Mingshen Jiang, Junmeng Cai and Bin Li

Energy, 2025, vol. 325, issue C

Abstract: Isoconversional kinetic analysis of a chemical reaction can effectively evaluate the activation energies, but it cannot directly determine the kinetic mechanism function (KMF). This study focuses on the complementary use of the Friedman isoconversional method and modified empirical KMF to investigate the kinetics of tobacco waste pyrolysis. The systematical analysis of the modified empirical KMF shows its abundant flexibility in describing various complex kinetics, as evidenced by diverse shape characteristics of kinetic curves. The kinetic results of tobacco waste pyrolysis were obtained by the integrated approach of the Friedman isoconversional method and modified empirical KMF: activation energies ranging from 176.3 to 352.5 kJ·mol−1 in the α range between 0.05 and 0.95 and the KMF for tobacco waste pyrolysis being f(α) = α−1.8931·(1–1.0206·α)5.9108. The combination of the Friedman isoconversional method with the modified empirical KMF serves as an effective method for conducting the comprehensive kinetic analysis of lignocellulosic biomass pyrolysis. The results can be used to establish the comprehensive and accurate chemical model, which is helpful for accurate numerical simulation of the biomass pyrolysis process, enabling the optimization of pyrolysis reactor configurations and operation conditions based on the numerical simulation results, thereby facilitating the industrial application of tobacco waste conversion.

Keywords: Kinetic mechanism function (KMF); Isoconversional analysis; Tobacco waste; Pyrolysis; Activation energy; Numerical calculation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:325:y:2025:i:c:s0360544225017335

DOI: 10.1016/j.energy.2025.136091

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