利用等转化和平行反应模型对两种簕杜鹃废物的缓慢热解行为和动力学进行热重分析

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Xuebai Guo , Cuixia Liu
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引用次数: 0

摘要

本研究通过热重分析法研究了两种竹子(Bambusa texlitis)废弃物的热解行为和动力学。通过转化率(α)曲线的曲率研究了热解的失重行为。α曲线的曲率可以描述假组分(半纤维素、纤维素和木质素)热解的特征温度。无模型模型用于估算纯组分的表观活化能,以便与其他动力学模型进行比较。动力学研究采用了三个平行反应模型(TPR)和平行有限数量一阶反应模型(FNFOR)。一阶 TPR 模型低估了伪成分的表观活化能。nth-order TPR 模型低估了木质素的表观活化能,并得到了与纯木质素不一致的特征温度。平行 FNFOR 模型在模拟木质纤维素生物质热解动力学方面更为可靠。伪成分的表观活化能取决于木质纤维素生物质的种类。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thermogravimetric analysis on two Bambusa texlitis wastes slow pyrolysis behaviors and kinetics using isoconversional and parallel-reactions models

Thermogravimetric analysis on two Bambusa texlitis wastes slow pyrolysis behaviors and kinetics using isoconversional and parallel-reactions models

In this work, the pyrolysis behaviors and kinetics of two bamboo (Bambusa texlitis) wastes were investigated via thermogravimetric analysis. The weight loss behaviors of pyrolysis were studied by curvature of the conversion (α) curves. The curvature of α can depict the characteristic temperatures of pseudo component (hemicellulose, cellulose and lignin) pyrolysis. Model-free model was applied to estimate the apparent activation energies of the pure components for comparison with other kinetic models. Three parallel reaction (TPR) and parallel finite number first-order reaction (FNFOR) models were used for kinetic studies. The first-order TPR model underestimates the apparent activation energies of pseudo components. The nth-order TPR model underestimates the apparent activation energy of lignin and obtains characteristic temperatures that are inconsistent with those of pure lignin. The parallel FNFOR model is more reliable for simulating the kinetics of lignocellulosic biomass pyrolysis. The apparent activation energies of pseudo components depend on the variety of lignocellulosic biomass.

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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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