Synergistic effect of biomass potassium content and oxidative atmosphere: Impact on torrefaction severity and released condensables

Macedo Lucélia, Silveira Edgar A., Rousset Patrick, Valette Jérémy, Commandre Jean-Michel. 2022. Synergistic effect of biomass potassium content and oxidative atmosphere: Impact on torrefaction severity and released condensables. Energy, 254 (Part C):124472, 16 p.

Résumé : This study investigates the synergistic behavior between oxidative atmosphere and potassium catalytic effects on woody (Amapaí) and non-woody (Miscanthus) biomass. Inert and oxygen-lean torrefaction was conducted at 275 °C for demineralized and K-loaded samples in fixed-bed and thermo-gravimetric equipment. Torrefaction improvement was assessed by torrefaction severity index (TSI), Catalytic Enhancement Area (CEA), Catalytic index (CI), and conversion rate (CR). Gas chromatography-mass spectrometry analyzed the impact on condensable compounds. The K% anticipated the biomass oxidation and the oxidative medium improved the catalytic effect. CEA and CI provided a reliable performance index (R2 > 0.90) to assess the synergistic effect. Condensable compound yields variation with increasing K% was similar for both atmospheres but the K-impact on the compounds production was intensified under oxidative conditions. The furfuryl alcohol yield increased by a factor of 30 for Amapaí comparing higher K% and demineralized samples, whereas a factor of 3 was observed for inert conditions. For Miscanthus, the factors of increasing production were 22 and 5 for oxidative and inert atmosphere. Under oxygen-lean, syringaldehyde and vanillin yields decreased with higher K%, whereas inert treatment revealed insignificant effects. The results indicate that torrefaction duration and targeted condensates production could be improved according to the K% and atmosphere.

Mots-clés Agrovoc : biomasse, biocarburant, Brosimum, Miscanthus, torréfaction, potassium, catalyse, composition chimique, synergisme

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Brosimum potabile

Mots-clés libres : Biomass, Oxidative torrefaction, Severity indexes, Potassium catalysis, Value-added chemicals

Classification Agris : K50 - Technologie des produits forestiers

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

Auteurs et affiliations

• Macedo Lucélia, Laboratory of Forest Products (BRA)
• Silveira Edgar A., UNB [Universidade de Brasilia] (BRA) - auteur correspondant
• Rousset Patrick, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-6956-7465
• Valette Jérémy, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0009-0000-3371-6417
• Commandre Jean-Michel, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0001-9094-7879

Source : Cirad-Agritrop (https://agritrop.cirad.fr/601114/)

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