Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin
Joint Authors
Gyurova, Kalinka
Georgieva, Velyana
Vlaev, Lyubomir
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-09-29
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
Thermogravimetric studies on two varieties of calcium carbonate, namely, analytical reagent-grade and in situ product from thermal degradation of calcium oxalate monohydrate, were carried out at four rates of linear increase of the temperature.
The kinetics and mechanism of their solid-state thermal decomposition reaction were evaluated from the TG data using four calculation procedures and isoconversion method, as well as 27 mechanism functions.
The comparison of the results obtained with these calculation procedures showed that they strongly depend on the selection of proper mechanism function for the process.
Therefore, it is very important to determine the most probable mechanism function.
In this respect the isoconversion calculation procedure turned out to be more appropriate.
In the present work, the values of apparent activation energy E, preexponential factor A in Arrhenius equation, as well as the changes of entropy ΔS≠, enthalpy ΔH≠, and free Gibbs energy ΔG≠ for the formation of the activated complex from the reagent are calculated.
All calculations were performed using programs compiled by ourselves.
American Psychological Association (APA)
Georgieva, Velyana& Vlaev, Lyubomir& Gyurova, Kalinka. 2012. Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin. Journal of Chemistry،Vol. 2013, no. 2013, pp.1-12.
https://search.emarefa.net/detail/BIM-505162
Modern Language Association (MLA)
Georgieva, Velyana…[et al.]. Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin. Journal of Chemistry No. 2013 (2013), pp.1-12.
https://search.emarefa.net/detail/BIM-505162
American Medical Association (AMA)
Georgieva, Velyana& Vlaev, Lyubomir& Gyurova, Kalinka. Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin. Journal of Chemistry. 2012. Vol. 2013, no. 2013, pp.1-12.
https://search.emarefa.net/detail/BIM-505162
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-505162