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Catalytic effect of potassium carbonate on condensable species released during wood torrefaction

Alves De Macedo Lucelia, Commandre Jean-Michel, Rousset Patrick, Valette Jérémy, Pétrissans Mathieu. 2017. Catalytic effect of potassium carbonate on condensable species released during wood torrefaction. In : Papers of the 25th European Biomass Conference: Setting the course for a biobased economy. Ek L. (ed.), Ehrnrooth H. (ed.), Scarlat N. (ed.), Grassi A. (ed.), Helm P. (ed.). ETA-Florence Renewable Energies, WIP-Renewable Energies. Florence : ETA-Florence Renewable Energies, pp. 1056-1062. ISBN 978-88-89407-17-2 European Biomass Conference and Exhibition (EUBCE 2017). 25, Stockholm, Suède, 12 June 2017/15 June 2017.

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Abstract : In order to investigate the effect of potassium addition on the composition of torrefaction condensates, two demineralized wood species were impregnated with different concentrations of K2CO3 and then torrefied at 275°C up to an anhydrous weight loss (AWL) of 25%. Torrefaction was carried out in both a thermogravimetric analysis (TGA) instrument and a laboratory fixed-bed reactor. Condensates from the fixed bed reactor were collected and analyzed by Gas Chromatography-Mass Spectroscopy (GC-MS). TGA showed that when potassium content increased in the biomass, shorter torrefaction times were sufficient to obtain the targeted AWL. GC-MS analysis showed, for both wood species, that potassium promotes the formation of acetol and slightly enhances acetic acid yield. The amount of some lignin derivatives (guaiacol, syringol, 4-vinylguaiacol) also rose with potassium addition. Yields of levoglucosan, LAC (1-hydroxy-(1R)-3,6- dioxabicyclo[3.2.1]octan-2-one) and DGP (1,4:3,6-dianhydro-a-d-glucopyranose), as well as furfural and 5-hydroxymethylfurfural, decreased drastically in the presence of potassium. (Résumé d'auteur)

Mots-clés libres : Torrefaction, Potassium, Thermogravimetric analysis, Lignin derivatives, Condensable species

Classification Agris : K50 - Processing of forest products
P06 - Renewable energy resources

Auteurs et affiliations

  • Alves De Macedo Lucelia, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Commandre Jean-Michel, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0001-9094-7879
  • Rousset Patrick, CIRAD-PERSYST-UPR BioWooEB (THA)
  • Valette Jérémy, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Pétrissans Mathieu, Université de Lorraine (FRA)

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Source : Cirad-Agritrop (https://agritrop.cirad.fr/584872/)

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