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|Title:||The applicability of isoconversional models in estimating the kinetic parameters of biomass pyrolysis|
|Author:||Baroni, Érico de Godois|
Rueda-Ordóñez, Yesid Javier
Tinoco-Navarro, Lizeth Katherine
|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|
|Appears in Collections:||FEQ - Artigos e Outros Documentos|
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