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A. Małecki, B. Prochowska-Klisch, R. Gajerski (1998)
Another Approach to the Modified Zhuravlev Equation on the Basis of the Oxidation of V2O4 and V6O13Journal of Thermal Analysis and Calorimetry, 54
A. Małecki, J. Doumerc (1986)
Extension of the diffusional kinetics models involving changes in activation energyJournal of thermal analysis, 31
Journal of Thermal Analysis and Calorimetry, Vol. 62 (2000) 325â327 Note T. Réti Bánki Donát Polytechnic, H-1081 Budapest, NépszÃnház 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 of Thermal Analysis and Calorimetry – Springer Journals
Published: Oct 1, 2000
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