New incremental isoconversional method for kinetic analysis of solid thermal decomposition
New incremental isoconversional method for kinetic analysis of solid thermal decomposition
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DOI：
10.1007/s10973-010-1029-9
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发表时间：
2011-05
影响因子：
4.4
通讯作者：
Yunqing Han;Haixiang Chen;Naian Liu
中科院分区：
文献类型：
--
作者：
Yunqing Han;Haixiang Chen;Naian Liu
基于Li-Tang （LT）方法，提出了一种简单、精确的固体热分解动力学分析的增量等转换积分方法，以评估活化能随转化率的变化规律。该方法克服了LT法计算活化能受积分下限影响的局限性。将新方法应用于碳酸锶热分解的模拟非等温情况和实验情况的动力学分析，结果表明，新方法计算的活化能与转化率的依赖关系与Friedman （FR）方法和改进的Vyazovkin方法的结果一致。由于该方法不需要逼近温度积分，对动力学数据的噪声不敏感，因此在固体分解的非等温动力学分析中更为方便。
A simple and precise incremental isoconversional integral method based on Li-Tang (LT) method is proposed for kinetic analysis of solid thermal decomposition, in order to evaluate the activation energy as a function of conversion degree. The new method overcomes the limitation of LT method in which the calculated activation energy is influenced by the lower limit of integration. By applying the new method to kinetic analysis of both the simulated nonisothermal case and experimental case of strontium carbonate thermal decomposition, it is shown that the dependence of activation energy on conversion degree evaluated by the new method is consistent with those obtained by Friedman (FR) method and the modified Vyazovkin method. As the new method is free from approximating the temperature integral and not sensitive to the noise of the kinetic data, it is believed to be more convenient in nonisothermal kinetic analysis of solid decompositions.