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The applicability of isoconversional models in estimating the kinetic parameters of biomass pyrolysis

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Abstract

The objective of this study was to discuss the applicability of isoconversional models in estimating the activation energy and pre-exponential factor for biomass pyrolysis. Thermogravimetry and derivative thermogravimetry experiments of tucumã endocarp were performed at the heating rates of 5, 10, and 20 °C min−1 in an atmosphere of nitrogen. The isoconversional models of Ozawa–Flynn–Wall, modified Coats–Redfern, Friedman, and Vyazovkin were applied to the experimental data, considering first-order rate law, resulting in activation energies of 147.25, 144.64, 160.47, and 144.96 kJ mol−1, respectively. The pre-exponential factor varied from 9.75 to 11.95 log s−1. As isoconversional models consider the solid decomposition to be represented by a single reaction, described by only one peak in the derivative thermogravimetry data, only a satisfactory agreement between experimental and theoretical data was observed. The fit was verified by simulating curves of conversion as a function of temperature, in which the kinetic parameters obtained with Ozawa–Flynn–Wall and Vyazovkin models generated the lowest relative deviations (9.05 and 9.3 %, respectively). In consequence, the use of isoconversional models is attractive because this kind of model is easy to apply, generating satisfactory approximations for the actual kinetic parameters.

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Acknowledgements

The authors are thankful for the financial support received from the Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil.

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Authors and Affiliations

  1. School of Chemical Engineering, University of Campinas, Avenida Albert Einstein, 500, Cidade Universitária “Zeferino Vaz”, Campinas, SP, 13083-852, Brazil

    Érico de Godois Baroni, Katia Tannous, Yesid Javier Rueda-Ordóñez & Lizeth Katherine Tinoco-Navarro

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  1. Érico de Godois Baroni
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  2. Katia Tannous
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Correspondence to Érico de Godois Baroni.

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Baroni, É.G., Tannous, K., Rueda-Ordóñez, Y.J. et al. The applicability of isoconversional models in estimating the kinetic parameters of biomass pyrolysis. J Therm Anal Calorim 123, 909–917 (2016). https://doi.org/10.1007/s10973-015-4707-9

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