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Kinetic analysis of the thermal decomposition of Zn(II) 2-chlorobenzoate complex with caffeine
Authors: Findoráková Lenka | Svoboda Roman
Year: 2012
Type of publication: článek v odborném periodiku
Name of source: Thermochimica Acta
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 113-117
Titles:
Language Name Abstract Keywords
cze Kinetická analýza tepelného rozkladu Zn(II) 2-chlorbenzoátového komplexu s kofeinem Kinetika prvních dvou kroků tepelného rozkladu Zn(II) 2-chlorbenzoátového komplexu s kofeinem byla studována pomocí termogravimetrie na vzduchu za neizotermních podmínek. Ačkoliv studované procesy se překrývaly, bylo možné stanovit jejich zdánlivou aktivační energii přímo z měřených dat. Dále byla na měřené píky použita dekonvoluční metoda, která umožnila stanovit kinetiku obou procesů. dekonvoluce; izokonverzní a neizokonverzní metody; JMA kinetický model; rozklad
eng Kinetic analysis of the thermal decomposition of Zn(II) 2-chlorobenzoate complex with caffeine Kinetics of the first two thermal decomposition steps of the complex [Zn(2-Clbenz)(2)(caf)(2)] (where 2-Clbenz = (C6R4Cl)(2)COO- and caf = caffeine) has been studied using differential thermogravimetry under non-isothermal conditions in air. Although the two studied processes partially overlap, it was found that apparent activation energy may be determined directly from the raw data using both, isoconversional and non-isoconversional methods. The original Kissinger method appears to perform better due to its robustness, however, the isoconversional methods on the other hand provide information about the onsets and endsets of the overlapping peaks. In order to complete kinetic analysis the peaks needed to be deconvoluted - the Fraser-Suzuki function was utilized in this approach. Based on the characteristic kinetic functions z(alpha) and y(alpha) it was found that both decompositions follow first order kinetics and can be described using the Johnson-Mehl-Avrami kinetic model. deconvolution; isoconversional and non-isocoversional methods; Johnson-Mehl-Avrami kinetic model; decomposition

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