Abstract To elucidate the mechanism of biomass lignin pyrolysis, the functional group evolution in lignin chars derived at 200–600 °C was investigated using two-dimensional perturbation correlation infrared spectroscopy, associated with the properties of the volatile products. Results from 2D-PCIS pointed that the change in the alcohol groups C–OH occurs earlier than that in the carbonyl groups C O before 250 °C, corresponding to the reaction of keto–enol tautomerization: C–OH → C O, and the cleavage of bonds and remodeling reactions of the side chains of the benzene rings are synchronous. Besides, the formation of simple substituted benzene structures was earlier than complex substituted benzene structures. Decarbonylation, dehydrogenation and dealkylation were intensified during polycondensation of benzene rings. These findings are significant for achieving an in-depth understanding of lignin pyrolysis.

中文翻译：

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基于固体炭官能团演化的木质素热解机理新认识

摘要 为了阐明生物质木质素热解的机理，使用二维微扰相关红外光谱研究了在 200-600 °C 下衍生的木质素炭中官能团的演变，并与挥发性产物的性质相关。2D-PCIS 的结果表明，在 250 °C 之前，醇基 C-OH 的变化比羰基 CO 的变化发生得更早，对应于酮-烯醇互变异构反应：C-OH → CO，以及苯环侧链的键合和重构反应是同步的。此外，简单取代苯结构的形成早于复杂取代苯结构。在苯环缩聚过程中，脱羰、脱氢和脱烷基作用加剧。