Abstract Hydrothermal carbonization (HTC) of pure cellulose (CE) and birchwood (BW) samples was carried out at temperatures between 160 and 280 °C, 0.5 h residence time and biomass-to-water ratio 1:5, to investigate the reactivity of cellulose in lignocellulosic biomass. Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) showed that the CE samples remained unaltered at temperatures up to 220 °C, but were significantly decomposed at 230 °C producing a thermal recalcitrant aromatic and high energy-dense material. FTIR showed that dehydration and aromatization reactions occurred at temperature equal or higher than 230 °C for the CE samples while a similar increase in aromatization for the BW hydrochars was evident only at temperatures equal or higher than 260 °C. Acid hydrolysis, TGA and FTIR suggested that a higher thermal resistance of naturally occurring cellulose in BW (when compared to CE sample) could be related to a ‘protecting shield’ offered by interlinked lignin in the plant matrix.

中文翻译：

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木质纤维素生物质水热碳化过程中纤维素的反应性

摘要 纯纤维素 (CE) 和桦木 (BW) 样品在 160 至 280 °C、0.5 h 停留时间和 1:5 生物质水比下进行水热碳化 (HTC)，以研究其反应性。木质纤维素生物质中的纤维素。热重分析 (TGA) 和傅里叶变换红外光谱 (FTIR) 表明，CE 样品在高达 220 °C 的温度下保持不变，但在 230 °C 时显着分解，产生热顽固的芳香族和高能量密度材料。FTIR 表明，CE 样品的脱水和芳构化反应发生在等于或高于 230 °C 的温度下，而 BW 加氢碳的芳构化类似增加仅在等于或高于 260 °C 的温度下才明显。酸水解，