Characterization and reactivity of soot from fast pyrolysis of lignocellulosic compounds and monolignols

Anna Trubetskaya*, Avery Brown, Geoffrey Tompsett, Michael T. Timko, Jens Kling, Markus Broström, Mogens Larsen Andersen, Kentaro Umeki

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    This study presents the effect of lignocellulosic compounds and monolignols on the yield, nanostructure and reactivity of soot generated at 1250 °C in a drop tube furnace. The structure of soot was characterized by electron microscopy techniques, Raman spectroscopy and electron spin resonance spectroscopy. The CO2 reactivity of soot was investigated by thermogravimetric analysis. Soot from cellulose was more reactive than soot produced from extractives, lignin and monolignols. Soot reactivity was correlated with the separation distances between adjacent graphene layers, as measured using transmission electron microscopy. Particle size, free radical concentration, differences in a degree of curvature and multi-core structures influenced the soot reactivity less than the interlayer separation distances. Soot yield was correlated with the lignin content of the feedstock. The selection of the extraction solvent had a strong influence on the soot reactivity. The Soxhlet extraction of softwood and wheat straw lignin soot using methanol decreased the soot reactivity, whereas acetone extraction
    had only a modest effect.
    Original languageEnglish
    JournalApplied Energy
    Volume212
    Pages (from-to)1489-1500
    ISSN0306-2619
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Fast pyrolysis
    • Lignocellulosic compounds and monolignols
    • Soot
    • Reactivity
    • Nanostructure

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