Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 61: Issue 1
A Thermoanalytical Study of the Solid State Reactions in the K2CO3-MxOy Systems. Evidence for a kinetic compensation effect
Authors:
S. Milić University of Belgrade Technical Faculty Bor P.O. Box 50 19210 Bor Yugoslavia

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N. Colović University of Belgrade Technical Faculty Bor P.O. Box 50 19210 Bor Yugoslavia

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M. Antonijević University of Belgrade Technical Faculty Bor P.O. Box 50 19210 Bor Yugoslavia

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F. Gaál University of Novi Sad Faculty of Sciences 21000 Novi Sad Yugoslavia

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Pages:
229–238
Online Publication Date:
02 Nov 2004
Publication Date:
01 Jul 2000
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010145615439
Keywords:
kinetic compensation effect; non-isothermal; potassium carbonate; solid state reactions; transition metals oxides
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Abstract  

This paper presents the results obtained in the investigation of the reactions of potassium carbonate with some transition metals oxides (TiO2 , V2 O5 , Cr2 O3 , MnO2 , Fe2 O3 ). The reactions were carried out under non-isothermal conditions, and thermogravimetric analysis was used to monitor the transformation degree a. Experimental data indicated that the reaction of potassium carbonate and iron(III) oxide occurs in one stage, whereas the reactions of the oxides of titanium, vanadium, chromium and manganese are more complex, involving two-stage processes. Activation energies and pre-exponential factors were determined for all the processes taking place in the investigated systems. For the second stage of the reaction of K2 CO3 with Cr2 O3 , and V2 O5 the obtained values of activation energy were 59.2 and 512 kJ mol−1 respectively. Based on the values of activation energy and pre-exponential factor, the existence of a kinetic compensation effect was postulated for the three homologous series of reactions.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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