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Pyrolysis behaviors, kinetics and gaseous product evolutions of two typical biomass wastes
Catalysis Today ( IF 5.2 ) Pub Date : 2020-12-29 , DOI: 10.1016/j.cattod.2020.12.023
Bin Tian , Xiuru Wang , Wanyi Zhao , Long Xu , Lei Bai

Rice husk (RH) and poplar bark (PB) as the staple biomass wastes represent herbaceous and woody plants, respectively. Thermo-chemical conversion of these wastes is a practical approach for value-added reclamation of bioenergy in large-quantity and pyrolysis plays core role in this process. In this work, RH and PB were subjected to comprehensive investigations on pyrolysis behavior, kinetics and gaseous product evolution in a thermogravimetry-Fourier transform infrared spectroscopy at different heating rates. The results demonstrated that both RH and PB underwent three consecutive pyrolysis stages, the TG/DTG curves shifted to higher temperature and the peak temperature intervals also enhanced as heating rate increased. It was observed CO2 was the most dominated species among oxygenated products, followed by Cdouble bondO bond containing species, while CH4 and arenes were abundant in hydrocarbon gases. In comparison, pyrolysis of RH could generate larger amounts of oxygenated products, and more hydrocarbons like CH4, arenes, and C2+ aliphatics were observed in the pyrolytic products of PB. Model-free kinetic methods showed that the average Ea were 209.1 kJ/mol and 203.9 kJ/mol for RH and PB, respectively. Criado model-fitting method indicated that pyrolysis of RH and PB both obeyed F1 reaction mechanism first and turned into one-dimensional diffusion and reaction mechanism, respectively at higher conversion of 0.25−0.60.



中文翻译:

两种典型生物质废物的热解行为、动力学和气态产物演化

稻壳(RH)和杨树皮(PB)作为主要生物质废物分别代表草本和木本植物。这些废物的热化学转化是生物能源大量增值回收的实用方法,热解在该过程中起着核心作用。在这项工作中,RH 和 PB 在不同加热速率下的热重-傅里叶变换红外光谱中进行了热解行为、动力学和气体产物演化的综合研究。结果表明,RH 和 PB 都经历了三个连续的热解阶段,TG/DTG 曲线向更高的温度移动,峰值温度间隔也随着加热速率的增加而增加。观察到 CO 2是氧化产物中最主要的物种,其次是 C双键含 O 键的物种,而 CH 4和芳烃在烃类气体中含量丰富。相比之下,RH的热解可以产生更多的氧化产物,并且在PB的热解产物中观察到更多的烃,如CH 4、芳烃和C 2+脂肪族化合物。无模型动力学方法表明,RH 和 PB的平均E a分别为 209.1 kJ/mol 和 203.9 kJ/mol。Criado 模型拟合方法表明 RH 和 PB 的热解均首先遵循 F1 反应机理,并分别在 0.25-0.60 的较高转化率下转化为一维扩散和反应机理。

更新日期:2020-12-29
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