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• W3049346036 abstract "Pyrolysis is the initial stage of biomass combustion, whereas, the pyrolysis mechanism of biomass, especially the hemicellulose component, is still not well elucidated. Herein, a common hemicellulose polysaccharide, xylan, was investigated to reveal the evolution of volatiles and solid residue through combined thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) and in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFT) techniques. Quantum chemistry calculation was also conducted to analyze the primary xylan pyrolysis mechanism by using a long-chain xylan model which was built based on the structural characterization of xylan. The experimental results indicated that the functional groups in solid-phase evolved intensively during the main weight loss zone (200–350 °C), leading to the violent release of volatiles. The decomposition of branches, especially the arabinose unit, was prior to that of the backbone, with relatively low energy barriers and high rate constants. The initial enhancement of CO vibration in solid-phase above 200 °C derived from the formation of the furanose unit. Both dehydration and breakage of glycosidic bonds were responsible for the formation of CC bond in solid-phase from 300 °C. The cracking of the 4-O-Me group resulted in the release of aldehydes to gas-phase in the main weight loss zone (200–350 °C). The scission of the whole 4-O-MeGlc unit and/or the rupture of the uronic acid group led to the gas-phase CO bond formation." @default.
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• W3049346036 date "2021-01-01" @default.
• W3049346036 modified "2023-10-17" @default.
• W3049346036 title "On the mechanism of xylan pyrolysis by combined experimental and computational approaches" @default.
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• W3049346036 doi "https://doi.org/10.1016/j.proci.2020.06.172" @default.
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