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

被引：38

作者：

Huidobro, Jose A. ^{[1
]}

Iglesias, Isabel ^{[2
]}

Alfonso, Belen F. ^{[2
]}

Espina, Aranzazu ^{[3
]}

Trobajo, Camino ^{[4
]}

Garcia, Jose R. ^{[4
]}

机构：

[1] Univ Oviedo, Escuela Politecn Ingn, Dept Matemat, Gijon 33204, Spain

[2] Univ Oviedo, Escuela Politecn Ingn, Dept Fis, Gijon 33204, Spain

[3] Univ Oviedo, CINN, Serv Cient Tecn, E-33006 Oviedo, Spain

[4] Univ Oviedo, CINN, Fac Quim, Dept Quim Organ & Inorgan, E-33006 Oviedo, Spain

来源：

CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS | 2016年 / 151卷

关键词：

Solid-state reactions; Thermal degradation; Kinetics; Isoconversional method; Friedman method; Activation energy; SOLID-STATE REACTIONS; INTEGRAL ISOCONVERSIONAL METHOD; THERMAL-ANALYSIS; KINETICS; THERMOGRAVIMETRY; COMPUTATIONS; TEMPERATURE;

D O I：

10.1016/j.chemolab.2015.12.012

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

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.

引用

页码：146 / 152

页数：7

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