Critical study on the identification of reaction mechanism by the shape of TG/DTG curves

It was proposed that the reaction mechanism of solid state reactions can be identified based on the asymmetry or shape of TG (Thermogravimetry) and DTG (Differential Thermogravimetry) curves in non-isothermal kinetics in the literature. A flow chart was also designed for the identification of the re...

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Bibliographic Details
Published in:Solid state sciences 2010-04, Vol.12 (4), p.455-460
Main Authors: Haixiang, Chen, Naian, Liu, Weitao, Zhao
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Non-isothermal kinetics
Reaction mechanism
Theory of reactions, general kinetics
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thermogravimetry
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Summary:It was proposed that the reaction mechanism of solid state reactions can be identified based on the asymmetry or shape of TG (Thermogravimetry) and DTG (Differential Thermogravimetry) curves in non-isothermal kinetics in the literature. A flow chart was also designed for the identification of the reaction mechanism by some authors. This paper has revisited this method and revised the flow chart with more reliable values of conversion at the maximum rate and the half width range of the DTG curves. The revised chart is proven to be more reasonable by an example application to identify the reaction mechanism of calcium carbonate decomposition and is recommended to replace the original one. [Display omitted]
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2009.12.007