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Short Comments on Kinetic Models Involving Changes in Activation Energy

Short Comments on Kinetic Models Involving Changes in Activation Energy Journal of Thermal Analysis and Calorimetry, Vol. 62 (2000) 325–327 Note T. Réti Bánki Donát Polytechnic, H-1081 Budapest, Népszínház u. 8, Hungary In a paper which earlier appeared in this journal [1], Malecki and co-workers applied a kinetic model based on the assumption that the activation energy changes as a function of temperature T and a degree of conversion . The non-constant activation energy Et was calculated via the following equation (see formulae (16) and (17) in Ref. [1]): Et=E0+Tf0() (1) where E0 is a positive constant, and f0() is an appropriately selected real function. It is worthwhile to note that the same equation was used in a much earlier paper [2]. In this short communication, we present a critical analysis of the mathematical treatment of Eq. (1), and show that the hypothesis involved in Eq. (1) leads to a false and quite complicated interpretation of the kinetics of the reaction investigated. Our concept and arguments are based on the following considerations: As a first step, let us re-write Eq. (1) in an equivalent form: Et=E0+RTf1() (2) where R is the universal gas constant, and function f1() is defined as f1()=f0()/R. As a second step, let us consider http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Thermal Analysis and Calorimetry Springer Journals

Short Comments on Kinetic Models Involving Changes in Activation Energy

Journal of Thermal Analysis and Calorimetry , Volume 62 (1) – Oct 1, 2000

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References (2)

Publisher
Springer Journals
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry; Polymer Sciences; Measurement Science, Instrumentation
ISSN
1388-6150
eISSN
1572-8943
DOI
10.1023/A:1010104020938
Publisher site
See Article on Publisher Site

Abstract

Journal of Thermal Analysis and Calorimetry, Vol. 62 (2000) 325–327 Note T. Réti Bánki Donát Polytechnic, H-1081 Budapest, Népszínház u. 8, Hungary In a paper which earlier appeared in this journal [1], Malecki and co-workers applied a kinetic model based on the assumption that the activation energy changes as a function of temperature T and a degree of conversion . The non-constant activation energy Et was calculated via the following equation (see formulae (16) and (17) in Ref. [1]): Et=E0+Tf0() (1) where E0 is a positive constant, and f0() is an appropriately selected real function. It is worthwhile to note that the same equation was used in a much earlier paper [2]. In this short communication, we present a critical analysis of the mathematical treatment of Eq. (1), and show that the hypothesis involved in Eq. (1) leads to a false and quite complicated interpretation of the kinetics of the reaction investigated. Our concept and arguments are based on the following considerations: As a first step, let us re-write Eq. (1) in an equivalent form: Et=E0+RTf1() (2) where R is the universal gas constant, and function f1() is defined as f1()=f0()/R. As a second step, let us consider

Journal

Journal of Thermal Analysis and CalorimetrySpringer Journals

Published: Oct 1, 2000

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