Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin
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...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
|
| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2013/872981 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850211065721257984 |
|---|---|
| author | Velyana Georgieva Lyubomir Vlaev Kalinka Gyurova |
| author_facet | Velyana Georgieva Lyubomir Vlaev Kalinka Gyurova |
| author_sort | Velyana Georgieva |
| collection | DOAJ |
| description | 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 , enthalpy , and free Gibbs energy for the formation of the activated complex from the reagent are calculated. All calculations were performed using programs compiled by ourselves. |
| format | Article |
| id | doaj-art-89795531b95c4046a4d7150ece42fd48 |
| institution | OA Journals |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-89795531b95c4046a4d7150ece42fd482025-08-20T02:09:38ZengWileyJournal of Chemistry2090-90632090-90712013-01-01201310.1155/2013/872981872981Non-Isothermal Degradation Kinetics of CaCO3 from Different OriginVelyana Georgieva0Lyubomir Vlaev1Kalinka Gyurova2Department of Physical Chemistry, Assen Zlatarov University, 8010 Burgas, BulgariaDepartment of Physical Chemistry, Assen Zlatarov University, 8010 Burgas, BulgariaDepartment of Physical Chemistry, Assen Zlatarov University, 8010 Burgas, BulgariaThermogravimetric 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 , enthalpy , and free Gibbs energy for the formation of the activated complex from the reagent are calculated. All calculations were performed using programs compiled by ourselves.http://dx.doi.org/10.1155/2013/872981 |
| spellingShingle | Velyana Georgieva Lyubomir Vlaev Kalinka Gyurova Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin Journal of Chemistry |
| title | Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin |
| title_full | Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin |
| title_fullStr | Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin |
| title_full_unstemmed | Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin |
| title_short | Non-Isothermal Degradation Kinetics of CaCO3 from Different Origin |
| title_sort | non isothermal degradation kinetics of caco3 from different origin |
| url | http://dx.doi.org/10.1155/2013/872981 |
| work_keys_str_mv | AT velyanageorgieva nonisothermaldegradationkineticsofcaco3fromdifferentorigin AT lyubomirvlaev nonisothermaldegradationkineticsofcaco3fromdifferentorigin AT kalinkagyurova nonisothermaldegradationkineticsofcaco3fromdifferentorigin |