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Article

Thermal Analysis and Kinetic Modeling of Pyrolysis and Oxidation of Hydrochars

1
Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy
2
Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: M. Toufiq Reza and Javier Fermoso
Energies 2022, 15(3), 950; https://doi.org/10.3390/en15030950
Received: 30 December 2021 / Revised: 20 January 2022 / Accepted: 24 January 2022 / Published: 27 January 2022
(This article belongs to the Special Issue Hydrothermal Carbonization)
This study examines the kinetics of pyrolysis and oxidation of hydrochars through thermal analysis. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques were used to investigate the decomposition profiles and develop two distributed activation energy models (DAEM) of hydrochars derived from the hydrothermal carbonization of grape seeds produced at different temperatures (180, 220, and 250 °C). Data were collected at 1, 3, and 10 °C/min between 30 and 700 °C. TGA data highlighted a decomposition profile similar to that of the raw biomass for hydrochars obtained at 180 and 220 °C (with a clear distinction between oil, cellulosic, hemicellulosic, and lignin-like compounds), while presenting a more stable profile for the 250 °C hydrochar. DSC showed a certain exothermic behavior during pyrolysis of hydrochars, an aspect also investigated through thermodynamic simulations in Aspen Plus. Regarding the DAEM, according to a Gaussian model, the severity of the treatment slightly affects kinetic parameters, with average activation energies between 193 and 220 kJ/mol. Meanwhile, the Miura–Maki model highlights the distributions of the activation energy and the pre-exponential factor during the decomposition. View Full-Text
Keywords: hydrothermal carbonization; modeling; kinetics; thermal analysis; Aspen Plus; biomass; hydrochar hydrothermal carbonization; modeling; kinetics; thermal analysis; Aspen Plus; biomass; hydrochar
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MDPI and ACS Style

Gonnella, G.; Ischia, G.; Fambri, L.; Fiori, L. Thermal Analysis and Kinetic Modeling of Pyrolysis and Oxidation of Hydrochars. Energies 2022, 15, 950. https://doi.org/10.3390/en15030950

AMA Style

Gonnella G, Ischia G, Fambri L, Fiori L. Thermal Analysis and Kinetic Modeling of Pyrolysis and Oxidation of Hydrochars. Energies. 2022; 15(3):950. https://doi.org/10.3390/en15030950

Chicago/Turabian Style

Gonnella, Gabriella, Giulia Ischia, Luca Fambri, and Luca Fiori. 2022. "Thermal Analysis and Kinetic Modeling of Pyrolysis and Oxidation of Hydrochars" Energies 15, no. 3: 950. https://doi.org/10.3390/en15030950

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