The kinetic characteristics of microwave‐assisted pyrolysis (MAP) of biomass components were investigated in a self‐designed microwave thermogravimetric analysis using the KAS model and the master plot method. Compared with conventional pyrolysis, the initial decomposition temperatures of biomass components were reduced by 50–100°C and the fastest weight loss regions were shifted to lower temperatures. The average apparent activation energies of cellulose, hemicellulose, and lignin were 47.82, 44.81, and 51.54 kJ/mol, respectively. Analysis with master plot method suggested the MAP of cellulose followed the 2‐D diffusion reaction model, while hemicellulose and lignin could be interpreted by third order‐based and 3‐D diffusion model. The change of dielectric properties was consistent with the weight loss behaviors of biomass components during the pyrolysis process. The increase of dielectric properties with temperature can lead to a thermal gradient and “hot spots” within biomass, which accelerated the pyrolysis process at low temperatures and reduced the apparent activation energy. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2124–2134, 2018

中文翻译：

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揭示低温微波辅助生物质组分的热解动力学行为和介电性能

利用KAS模型和主图法，在自行设计的微波热重分析中研究了生物质组分的微波辅助热解（MAP）的动力学特征。与传统的热解相比，生物质组分的初始分解温度降低了50–100°C，并且最快的失重区域转移到了较低的温度。纤维素，半纤维素和木质素的平均表观活化能分别为47.82、44.81和51.54 kJ / mol。用主图解法分析表明，纤维素的MAP遵循2-D扩散反应模型，而半纤维素和木质素可以由基于三阶和3-D扩散模型的解释。介电性能的变化与热解过程中生物质组分的失重行为一致。介电性能随温度的升高会导致生物质内出现热梯度和“热点”，从而加速了低温下的热解过程并降低了表观活化能。©2018美国化学工程师学会AIChE J，64：2124-2134，2018年