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Insight into Pyrolysis Kinetics of Lignocellulosic Biomass: Isoconversional Kinetic Analysis by the Modified Friedman Method
Energy & Fuels ( IF 5.3 ) Pub Date : 2020-03-18 , DOI: 10.1021/acs.energyfuels.0c00275
Laipeng Luo 1 , Xiaojuan Guo 2 , Zhen Zhang 3 , Meiyun Chai 1 , Md. Maksudur Rahman 1 , Xingguang Zhang 4 , Junmeng Cai 1
Affiliation  

Isoconversional methods are commonly used to process the thermogravimetric analysis (TGA) data and to simultaneously obtain the effective activation energies for lignocellulosic biomass pyrolysis. However, the widely used isoconversional methods may lead to some systematic problems, for example, numerical instability for the Friedman method and significant errors in the kinetic parameters for the Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose methods. To avoid the above problems, a modified Friedman isoconversional method has been developed in this work to accurately determine effective activation energies for solid-state reactions, such as biomass pyrolysis reactions. Through processing theoretically simulated data of strongly varying activation energy, the modified method applying for narrow intervals of conversion degree was proven to be capable of calculating the conversion dependence of activation energy accurately and reducing the effect of data noise. The modified Friedman isoconversional method was employed to process the non-isothermal TGA data of wheat straw pyrolysis at heating rates of 2.5, 5, 10, and 20 K min–1 and the kinetic data of beech sawdust pyrolysis at 5, 10, and 20 K min–1 from the literature. The results showed that the effective activation energies for the pyrolysis of wheat straw and beech sawdust varied significantly with the degree of conversion (in the conversion range from 0.05 to 0.85, the effective activation energies for wheat straw pyrolysis varied from 154 to 379 kJ mol–1, while 155–316 kJ mol–1 was reported for beech sawdust pyrolysis).

中文翻译:

木质纤维素生物质热解动力学的洞察力:改进的弗里德曼方法的等转化动力学分析

等转换方法通常用于处理热重分析(TGA)数据,并同时获得木质纤维素生物质热解的有效活化能。但是,广泛使用的等转换方法可能会导致一些系统性的问题,例如,弗里德曼方法的数值不稳定性以及弗林-沃尔-小泽和基辛格-阿卡希拉-Sunose方法的动力学参数存在重大误差。为了避免上述问题,在这项工作中开发了一种改进的弗里德曼同转化方法,以准确确定固态反应(例如生物质热解反应)的有效活化能。通过处理理论上模拟的活化能变化很大的数据,实践证明,该方法适用于转换程度的窄区间,能够准确计算出活化能的转换依赖性,并能减少数据噪声的影响。采用改进的弗里德曼等转化方法,以2.5、5、10和20 K min的加热速率处理麦草热解的非等温TGA数据。–1和山毛榉木屑在5、10和20 K min时热解的动力学数据–1文献中。结果表明,小麦秸秆和山毛榉木屑热解的有效活化能随转化度的变化而显着变化(在0.05至0.85的转化范围内,小麦秸秆热解的有效活化能从154至379 kJ mol – 1,据报道山毛榉木屑热解为155–316 kJ mol –1)。
更新日期:2020-04-23
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