The determination of kinetic parameters from DTG curves — fact or fiction?

One way to determine the kinetic parameters of a reaction with an associated loss in mass is by the production of a log plot viz. ln[(d α/d t)/(fn( α))] = ln A − E/( RT). The situation that arises when two or more reactions are occurring simultaneously is discussed. It is shown that the log plot can...

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Bibliographic Details
Published in:Thermochimica acta 1999-12, Vol.340, p.77-87
Main Author: Wilburn, F.W.
Format: Article
Language:English
Subjects:
Activation energy
Computer programs
DTG curves
Pre-exponential constant
Reaction equations
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Summary:One way to determine the kinetic parameters of a reaction with an associated loss in mass is by the production of a log plot viz. ln[(d α/d t)/(fn( α))] = ln A − E/( RT). The situation that arises when two or more reactions are occurring simultaneously is discussed. It is shown that the log plot can often help to elucidate that a complex reaction is proceeding, even when this is not obvious from the shape of the DTG curve. The influence on the shape of the log plot, when the activation energy E and/or the pre-exponential constant A varies either with temperature or extent of reaction, is discussed.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(99)00255-5