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Kinetics of the non-isothermal decomposition of Cu-and Co-itaconato complexes

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Abstract

The kinetics of the thermal decomposition of Cu- and Co-itaconato complexes were studied using dynamic thermogravimetric techniques. The dehydration process was found to proceed in a one-stage reaction, while the thermal decomposition of the anhydrous salts was followed a two-stage reaction. The first stage is the decomposition of the complex to metal carbonate, whereas the second stage is the decomposition of the formed carbonate to the oxide. Kinetic analysis of the dynamic TG curves were discussed with reference to a composite integral method on comparison with the integral methods of Coats and Redfern and Ozawa. The activation parameters were calculated and discussed for each decomposition step.

Zusammenfassung

Mittels DTG wurde die Kinetik der thermischen Zersetzung von Cu- und Co-Itakonato-Komplexen untersucht. Man fand, daß der Dehydratierungsprozeß eine Einschritt-Reaktion ist, während die thermische Zersetzung der wasserfreien Salze in zwei Schritten verläuft. Der erste Teilschritt ist die Zersetzung des Komplexes in Metallcarbonat, der darauffolgende Schritt die Zersetzung des gebildeten Carbonates zu Oxid. Die kinetische Analyse der DTG-Kurven wurde bezüglich einer zusammengesetzten Integrationsmethode im Vergleich zu den Integrationsmethoden von Coats und Redfern und Ozawa ausgewertet. Für jeden Schritt der Zersetzung wurden die Aktivierungs-parameter berechnet und diskutiert.

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El-Bellihi, A.A. Kinetics of the non-isothermal decomposition of Cu-and Co-itaconato complexes. Journal of Thermal Analysis 41, 191–200 (1994). https://doi.org/10.1007/BF02547024

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