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Article Abstract
Thermal evolution of functional groups during pyrolysis of wheat and rice straws was investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy at 200 °C to 400 °C. Aromatic rings transitioned through substitution states, with tri-/tetra-/penta-substituted configurations coexisting below 300 °C before complete conversion to tri-substituted forms. Oxygen-containing groups showed bifurcated behaviour: ether CO bonds decreased by 15.4-28.9 %, while lignin-associated CO bonds increased 47.1-68.5 %, with COC asymmetric stretching attenuating 9.5 %. Phenolic CO bonds became thermally labile above 350 °C. Alkane CH maintained structural stability below 350 °C. Hydroxyl groups displayed dual-phase evolution: 23.4-35.6 % intensity gain below 250 °C followed by >95 % depletion above 400 °C. Quantitative correlations between pyrolysis thresholds and functional group stability provided critical parameters for optimizing biomass pyrolysis.
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| http://dx.doi.org/10.1016/j.biortech.2025.133125 | DOI Listing |
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