Evolution in functional groups of agricultural straw during pyrolysis at elevated temperature: In situ synchrotron radiation infrared spectroscopy
Xu T. Chen L. Chen J. Assem S.
December 2025Elsevier Ltd
Bioresource Technology
2025#437
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 C[sbnd]O bonds decreased by 15.4–28.9 %, while lignin-associated C[sbnd]O bonds increased 47.1–68.5 %, with C[sbnd]O[sbnd]C asymmetric stretching attenuating 9.5 %. Phenolic C[sbnd]O bonds became thermally labile above 350 °C. Alkane CH2 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.
Aromatic rings , Biomass , Oxygen-containing groups , Thermal evolution , Wheat straw
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College of Energy Engineering, Xian University of Science and Technology, Shaanxi, 710054, China
Faculty of Biology and Biotechnology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
College of Energy Engineering
Faculty of Biology and Biotechnology
10 лет помогаем публиковать статьи Международный издатель
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