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Reducing the effects of noise in the calculation of activation energy by the Friedman method

机译:弗里德曼法在计算活化能时减少噪声的影响

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The Friedman method for analysis of kinetic parameters of solid-state reactions has been widely used. One of the drawbacks of this method is its sensitivity to noise which can be caused by both experimental error and the intrinsic inaccuracy of the differential methods, particularly for non-isothermal kinetic data obtained by means of thermogravimetric analysis (TGA). This paper proposes a modified version of the Friedman method in order to decrease the effect of noise and consequently obtain more accurate activation energy values. The new method is based on the idea of considering, for a given value of the extent of conversion a, not only information corresponding to a but also data in its neighbourhood. To check the procedure, it is applied to simulated data and the activation energy obtained is compared with the preset value and that given by the Friedman method. Moreover, the proposed method is used to determine the activation energy on the thermal degradation of gamma-Ti(PO4)(NH4HPO4) compound as a function of the extent of conversion. (C) 2015 Elsevier B.V. All rights reserved.
机译:用于固态反应动力学参数的弗里德曼方法已被广泛使用。这种方法的缺点之一是它对噪声的敏感性,这可能是由于实验误差和差分方法的固有误差所引起的,尤其是对于通过热重分析(TGA)获得的非等温动力学数据而言。本文提出了Friedman方法的改进版本,以减少噪声的影响,从而获得更准确的活化能值。新方法基于这样的思想:对于给定的转换程度a的值,不仅考虑与a对应的信息,而且考虑其附近的数据。为了检查该过程,将其应用于模拟数据,并将获得的活化能与预设值和弗里德曼方法给出的活化能进行比较。此外,所提出的方法用于确定转化率对γ-Ti(PO4)(NH4HPO4)化合物热降解的活化能。 (C)2015 Elsevier B.V.保留所有权利。

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