The non-isothermal decomposition of cobalt acetate tetrahydrate |
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Authors: | M A Mohamed S A Halawy M M Ebrahim |
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Institution: | (1) Department of Chemistry, Faculty of Science, Qena, Egypt |
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Abstract: | The non-isothermal decomposition of cobalt acetate tetrahydrate was studied up to 500°C by means of TG, DTG, DTA and DSC techniques
in different atmospheres of N2, H2 and in air. The complete course of the decomposition is described on the basis of six thermal events. Two intermediate compounds
(i.e. acetyl cobalt acetate and cobalt acetate hydroxide) were found to participate in the decomposition reaction.
IR spectroscopy, mass spectrometry and X-ray diffraction analysis were used to identify the solid products of calcination
at different temperatures and in different atmospheres. CoO was identified as the final solid product in N2, and Co3O4 was produced in air. A hydrogen atmosphere, on the other hand, produces cobalt metal. Scanning electron microscopy was used
to investigate the solid decomposition products at different stages of the reaction. Identification of the volatile gaseous
products (in nitrogen and in oxygen) was performed using gas chromatography. The main products were: acetone, acetic acid,
CO2 and acetaldehyde. The proportions of these products varied with the decomposition temperature and the prevailing atmosphere.
Kinetic parameters (e.g.E and lnA) together with thermodynamic functions (e.g. °H, C
p and °S) were calculated for the different decomposition steps.
In celebration of the 60th birthday of Dr. Andrew K. Galwey |
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Keywords: | cobalt acetate tetrahydrate IR kinetics MS non-isothermal decomposition thermodynamic study TG-DTG-DTA-DSC X-ray |
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