Abstract
Cadmium carbonate used in the study was prepared from cadmium chloride, ammonium carbonate and ammonia. The X-ray powder diffraction, infrared spectral and chemical analysis conducted on the product show that the sample is of analytically acceptable purity. The thermal decomposition kinetics of cadmium carbonate was then studied by using the isothermal thermogravimetric method under a flow of dry nitrogen gas. The decomposition kinetics is best described by a two-dimensional phase boundary reaction mechanism (R 2). An activation energy (E a) of 135.006 kJ·mol−1 and natural logarithm of the frequency factor (lnZ) of 16.754 were obtained in the range of 9 temperatures (400, 390, 380, 370, 360, 350, 340, 330 and 320°C).
Zusammenfassung
Das in der Untersuchung verwendete Kadmiumkarbonat wurde aus Kadmiumchlorid, Ammoniumkarbonat und Ammoniak hergestellt. Am Produkt durchgeführte Pulver-Röntgendiffraktion, Infrarotspektral- und chemische Analyse zeigen, daß die Probe von analytisch annehmbarer Reinheit ist. Mittels isothermer gravimetrischer Methode unter trockenem Stickstoffgasfluß wurde dann anschließend die Kinetik der thermischen Zersetzung von Kadmiumkarbonat untersucht. Die Zersetzungskinetik wird am besten durch eine zweidimensionalen Phasengrenzschicht-Reaktionsmechanismus (R 2) beschrieben. Im Bereich von 9 Temperaturen (400, 390, 380, 370, 360, 350, 340, 330 und 320°C) wurde eine Aktivierungsenergie vonE a=135.006 kJ/mol und für den Frequenzfaktor ein natürlicher Logarithmus (lnZ) von 16.754 gefunden.
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Bultosa, G., Mulokozi, A.M. Kinetics of the thermal decomposition of cadmium carbonate (CdCO3). Journal of Thermal Analysis 45, 1339–1348 (1995). https://doi.org/10.1007/BF02547428
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DOI: https://doi.org/10.1007/BF02547428