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Conference Papers Year : 2017

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

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)
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Dates and versions

hal-02371107 , version 1 (19-11-2019)

Identifiers

  • HAL Id : hal-02371107 , version 1

Cite

Lucélia Alves De Macedo, Jean-Michel Commandré, Patrick Rousset, Jeremy Valette, Mathieu Petrissans. Catalytic effect of potassium carbonate on condensable species released during wood torrefaction. 25th European Biomass Conference and Exhibition Proceedings. ETA-Florence Renewable Energies. Stockholm, Suède, 12 Juin 2017/15 Juin 2017., Jun 2017, Stockholm, Sweden. ⟨hal-02371107⟩
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