Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China.
Bioresour Technol. 2021 Jun;329:124860. doi: 10.1016/j.biortech.2021.124860. Epub 2021 Feb 21.
An in-depth understanding of peanut shell pyrolysis reaction is essential for its efficient utilization. Detailed analysis of thermodynamics, kinetics, and reaction products can provide valuable information about pyrolysis reaction. In this work, pyrolytic reaction mechanism was elucidated with the analysis of thermogravimetric-mass spectrometry and the structural characterization of the derived biochar. The thermodynamic and kinetic parameters of three sub-stages were matched well in different model-free methods. The positive ΔH and ΔG values indicated that the pyrolysis reactions for three stages were endothermic and nonspontaneous. The reaction mechanism predicted by integral master-plots were F3 (f(α) = (1-α)), F1 (f(α) = (1-α), and F3 (f(α) = (1-α)) for the three sub-stages, respectively. The negative ΔS in the third stage was related to the reduced releasing of low-molecular weight gases and ordered graphite-like carbon structure. This study provides a prospective approach to understand the pyrolysis mechanism of biomass.
深入了解花生壳热解反应对于其有效利用至关重要。详细分析热力学、动力学和反应产物可以提供有关热解反应的有价值信息。在这项工作中，通过热重-质谱分析和衍生生物炭的结构表征，阐明了热解反应机制。三个子阶段的热力学和动力学参数在不同的无模型方法中匹配良好。正的 ΔH 和 ΔG 值表明三个阶段的热解反应都是吸热和非自发的。整体主图预测的反应机制分别为 F3（f(α) = (1-α)）、F1（f(α) = (1-α)）和 F3（f(α) = (1-α)）。第三阶段的负 ΔS 与低分子量气体释放减少和有序石墨状碳结构有关。本研究为理解生物质热解机制提供了一种有前景的方法。
