Thermo-acoustic catalytic effect on oxidizing woody torrefaction

Silveira Edgar A., Oliveira Galvão Luiz Gustavo, Alves de Macedo Lucelia, Sá Isabella A., Chaves Bruno S., Girão de Morais Marcus Vinícius, Rousset Patrick, Caldeira-Pires Armando. 2020. Thermo-acoustic catalytic effect on oxidizing woody torrefaction. Processes, 8 (11):1361, 15 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
Published version - Anglais
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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.

Mots-clés Agrovoc : Torréfaction, Technologie du bois, Pyrolyse, Catalyse, Propriété du bois, Combustible solide, Eucalyptus grandis, Activité catalytique, production de biomasse

Mots-clés libres : Woody biomass torrefaction, Thermoacoustic, Catalytic effect, Numerical modeling, Severity factors

Classification Agris : K50 - Processing of forest products
J12 - Handling, transport, storage and protection of forest products
Q60 - Processing of non-food or non-feed agricultural products

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Auteurs et affiliations

  • Silveira Edgar A., UNB [Universidade de Brasilia] (BRA) - auteur correspondant
  • Oliveira Galvão Luiz Gustavo, BSF (BRA)
  • Alves de Macedo Lucelia, BSF (BRA)
  • Sá Isabella A., UNB [Universidade de Brasilia] (BRA)
  • Chaves Bruno S., Brazilian Forest Service (BRA)
  • Girão de Morais Marcus Vinícius, UNB [Universidade de Brasilia] (BRA)
  • Rousset Patrick, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Caldeira-Pires Armando, UNB [Universidade de Brasilia] (BRA)

Source : Cirad-Agritrop (

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