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Thermal degradation of rice husk: Effect of pre-treatment on kinetic and thermodynamic parameters

机译：稻壳的热降解：预处理对动力学和热力学参数的影响

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摘要

Pyrolysis of untreated, acid treated and alkali treated rice husk (URH, ARH and ALRH, respectively) was investigated. Pre-treatment resulted in change in values of proximate and ultimate analyses parameters, gross calorific values and cellulose, hemi-cellulose and lignin contents. Thermal degradation experiments were carried out from ambient to 800 degrees C at heating rates of 5, 10 and 15 degrees C/min in presence of nitrogen (flow rate 50 mL/min). Analysis of the pyrolysis data was carried out using, Flynn - Wall - Ozawa (FWO), Kissinger - Akahira - Sunose (KAS) and Starink iso-conversional models. The activation energy was estimated to be 219.67, 220.09 and 218.83 kJ/mol using FWO model; 222.18, 222.69 and 227.98 kJ/mol using KAS model and 222.19, 223.57 and 228.38 kJ/mol using Starink model for URH, ARH and ALRH, respectively. Thermodynamic parameters (Delta H, Delta G, Delta S) were also evaluated in each case. Effect of pre-treatment on the pyrolysis reaction mechanism was predicted using Criado method. The results indicated that pre-treatment of RH improved its thermal degradation process.
机译：研究了未处理，酸处理和碱处理稻壳（分别尿液，ARH和ALH）的热解。预处理导致邻近和最终分析参数的值的变化，粗量热值和纤维素，半纤维素和木质素含量。在氮气存在下，在5,10和15摄氏度的加热速率下，在800度和800℃下，在氮气的加热速率（流速50ml / min），热降解实验。热解数据分析使用，Flynn-Wall - Ozawa（FWO），基辛格 - Akahira - Sunose（KAS）和明星Iso-Connestional Models。使用FWO模型估计激活能量为219.67,220.09和218.83 kJ / mol; 222.18,222.69和227.98 kJ / mol使用KAS模型和222.19,223.57和228.38 kJ / mol分别用于URH，ARH和ALH的Quarink模型。在每种情况下，还评估了热力学参数（Delta H，Delta G，Delta S）。利用CRIADO方法预测了预处理对热解反应机理的影响。结果表明RH的预处理改善了其热降解过程。

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