Meaningful activation energies for complex systems II

Dowdy, D. R.

doi:10.1007/bf01905172

Cited by 23 publications

(13 citation statements)

References 7 publications

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“…(6) were used by Dowdy,14 who quantitatively compared the methods and estimated the systematic error of the integral method [eq. (6)] to be less than 4%.…”

Section: Integral Isoconversional Methodsmentioning

confidence: 99%

Modification of the integral isoconversional method to account for variation in the activation energy

2000

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ABSTRACT:Integral isoconversional methods may give rise to noticeable systematic error in the activation energy when the latter strongly varies with the extent of conversion. This error is eliminated by using an integration technique that properly accounts for the variation in the activation energy. The technique is implemented as a modification of the earlier proposed advanced isoconversional method [Vyazovkin, S. J Comput Chem 1997, 18, 393]. The applications of the modified method are illustrated by simulations as well as by processing of data on the thermal decomposition of calcium oxalate monohydrate and ammonium nitrate.

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“…(6) were used by Dowdy,14 who quantitatively compared the methods and estimated the systematic error of the integral method [eq. (6)] to be less than 4%.…”

Section: Integral Isoconversional Methodsmentioning

confidence: 99%

Modification of the integral isoconversional method to account for variation in the activation energy

2000

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“…The use of these methods requires recording the α = α(T ) curves for several heating rates. It was shown [24][25][26] that if the activation energy depends on α, the use of various isoconversional methods lead to various values of the activation energy for a given value of the degree of conversion. The problem that arises is which method leads to the correct dependence E = E(α).…”

Section: Introductionmentioning

confidence: 99%

Some methodological problems concerning nonisothermal kinetic analysis of heterogeneous solid–gas reactions

Budrugeac

Segal

2001

Int J of Chemical Kinetics

140

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Isoconversional methods, those using only one curve α = α(T ) (α is the conversion degree and T is the temperature), and invariant kinetic parameter method were applied to estimate the kinetic parameters from the following nonisothermal data: (1) simulated TG curves for a single reaction; (2) TG curves for thermal degradation of PVC; and (3) TG curves for the dehydration of CaC 2 O 4 ·H 2 O. The results obtained by applying various methods for the same system are compared and discussed. Finally, a procedure of kinetic analysis is suggested. Its application could lead to kinetic parameter values that can be used to predict either α = α(t) curves for other heating rates or α = α(T ) curves for isothermal conditions.

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“…Essenhigh [3] has summarized the various kinetic schemes proposed for the analysis of coal pyrolysis data. Dowdy [7,8] has used a slightly different approach in attempting to describe the kinetics of the overall reaction by introducing an 'instantaneous mean activation energy'. See Elder [4], Elder and Harris [5] or Elder and Reddy [6] for pertinent references.…”

mentioning

confidence: 99%

Multiple reaction scheme modelling

Elder

1988

Journal of Thermal Analysis

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A simple procedure whereby the energies of activation and pre-exponential factors of the individual reactions, of any kinetic model, comprising a wide variety of multiple reaction sets, is described. The sets belong to one of three classes, such that the single extent of reaction-temperature curves diverge, converge or are equally spaced at one prescribed temperature. The method has been applied to sets of first order reactions, which yield effective n tb order reactions with the order 'n'varying from ~ 0.6 to ~ 3.0. Variations in Friedman iso-conversional reaction kinetics analytical data are indicative of the designed reaction complexity.

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Meaningful activation energies for complex systems II

Cited by 23 publications

References 7 publications

Modification of the integral isoconversional method to account for variation in the activation energy

Modification of the integral isoconversional method to account for variation in the activation energy

Some methodological problems concerning nonisothermal kinetic analysis of heterogeneous solid–gas reactions

Multiple reaction scheme modelling

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