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Non-isothermal kinetic study of fodder radish seed cake pyrolysis: performance of model-free and model-fitting methods
Brazilian Journal of Chemical Engineering ( IF 1.2 ) Pub Date : 2020-02-07 , DOI: 10.1007/s43153-020-00023-z
Janaína Junges , Wendel Paulo Silvestre , Daniela De Conto , Camila Baldasso , Eduardo Osório , Marcelo Godinho

The scientific community has shown concern about the suitable application of different methods (model-free/model-fitting) for the determination of kinetic parameters. The application of an unsuitable method may lead to unreliable kinetic parameters. In this study, the performance of five methods for the determination of the kinetic parameters of fodder radish seed cake (FRSC) pyrolysis was evaluated. This is the first detailed study of the pyrolysis kinetics of FRSC. The characterization was performed through thermogravimetric analysis at different heating rates (5, 10, and 25 K/min) and temperatures ranged from 298 to 1073 K. Four model-free isoconversional methods (Friedman, Kissinger, Kissinger–Akahira–Sunose and Flynn–Wall–Ozawa) were used to determine the activation energy. A model-fitting (five pseudo-components model—FPCM) method was used to obtain the kinetic parameters of fodder radish seed cake pyrolysis. A detailed evaluation of the performance of these methods to estimate the kinetic parameters of fodder radish seed cake pyrolysis was performed. The Criado method was applied to verify reaction mechanisms that governed the pyrolysis process. The activation energies (Ea) ranged from 127.70 to 991.53 kJ/mol from the four model-free methods, which presented themselves as unreliable. The FPCM presented a better performance, with higher R2 values. At low conversions, pyrolysis was controlled by diffusion mechanisms, while at higher conversions, a third-order reaction became the governing pyrolysis mechanism.

中文翻译:

饲料萝卜籽饼热解的非等温动力学研究:无模型和模型拟合方法的性能

科学界对不同方法(无模型/模型拟合)用于确定动力学参数的适当应用表示关注。应用不合适的方法可能会导致不可靠的动力学参数。在本研究中,评估了五种测定饲料萝卜籽饼 (FRSC) 热解动力学参数的方法的性能。这是对 FRSC 热解动力学的首次详细研究。通过热重分析在不同的加热速率(5、10 和 25 K/min)和 298 到 1073 K 的温度范围内进行表征。四种无模型等转化方法(Friedman、Kissinger、Kissinger-Akahira-Sunose 和 Flynn- Wall–Ozawa) 用于确定活化能。采用模型拟合(五伪组分模型——FPCM)方法获得饲料萝卜籽饼热解动力学参数。对这些方法的性能进行了详细评估,以估计饲料萝卜籽饼热解的动力学参数。Criado 方法用于验证控制热解过程的反应机制。四种无模型方法的活化能 (Ea) 范围从 127.70 到 991.53 kJ/mol,这表明它们不可靠。FPCM 表现出更好的性能,具有更高的 R2 值。在低转化率下,热解由扩散机制控制,而在高转化率下,三级反应成为控制热解机制。对这些方法的性能进行了详细评估,以估计饲料萝卜籽饼热解的动力学参数。Criado 方法用于验证控制热解过程的反应机制。四种无模型方法的活化能 (Ea) 范围从 127.70 到 991.53 kJ/mol,这表明它们不可靠。FPCM 表现出更好的性能,具有更高的 R2 值。在低转化率下,热解由扩散机制控制,而在高转化率下,三级反应成为控制热解机制。对这些方法的性能进行了详细评估,以估计饲料萝卜籽饼热解的动力学参数。Criado 方法用于验证控制热解过程的反应机制。四种无模型方法的活化能 (Ea) 范围从 127.70 到 991.53 kJ/mol,这表明它们不可靠。FPCM 表现出更好的性能,具有更高的 R2 值。在低转化率下,热解由扩散机制控制,而在高转化率下,三级反应成为控制热解机制。来自四种无模型方法的 70 到 991.53 kJ/mol,这表明它们不可靠。FPCM 表现出更好的性能,具有更高的 R2 值。在低转化率下,热解由扩散机制控制,而在高转化率下,三级反应成为控制热解机制。来自四种无模型方法的 70 到 991.53 kJ/mol,这表明它们不可靠。FPCM 表现出更好的性能,具有更高的 R2 值。在低转化率下,热解由扩散机制控制,而在高转化率下,三级反应成为控制热解机制。
更新日期:2020-02-07
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