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Title: Thermo-acoustic catalytic effect on oxidizing woody torrefaction
Authors: Silveira, Edgar Amaral
Galvão, Luiz Gustavo Oliveira
Macedo, Lucélia Alves de
Sá, Isabella A.
Chaves, Bruno Sant'Anna
Morais, Marcus Vinícius Girão de
Rousset, Patrick
Caldeira-Pires, Armando de Azevedo
Assunto:: Torrefação
Modelagem numérica
Issue Date: 28-Oct-2020
Publisher: MDPI
Citation: SILVEIRA, Edgar A. et al. Thermo-acoustic catalytic effect on oxidizing woody torrefaction. Processes, v. 8, n. 11, 1361, 2020. DOI: Disponível em: Acesso em: 12 jan. 2021.
Abstract: The torrefaction (mild pyrolysis) process modifies biomass chemical and physical properties and is applied as a thermochemical route to upgrade solid fuel. In this work, the catalytic effect of thermo-acoustic on oxidizing woody torrefaction is assessed. The combined effect of two acoustic frequencies (1411, 2696 Hz) and three temperatures (230, 250, and 290 °C) was evaluated through weight loss and its deviation curves, calculated torrefaction severity index (TSI), as well as proximate, calorific, and compression strength analysis of Eucalyptus grandis. A new index to account for the catalytic effects on torrefaction (TCEI) was introduced, providing the quantitative analysis of acoustic frequencies influence. A two-step consecutive reaction numerical model allowed the thermo-acoustic experiment evaluation. For instance, the thermogravimetric profiles revealed that the acoustic field has a catalytic effect on wood torrefaction and enhances the biomass oxidation process for severe treatments. The kinetic simulation of the acoustic coupling resulted in faster conversion rates for the solid pseudo-components showing the boosting effect of acoustic frequencies in anticipating hemicellulose decomposition and enhancing second step oxidizing reaction.
Licença:: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Appears in Collections:EFL - Artigos publicados em periódicos
ENM - Artigos publicados em periódicos

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