Thermal decomposition kinetics of Brazilian limestones : effect of CO2 partial pressure
The influence of the partial pressure of carbon dioxide (CO2) on the thermal decomposition process of a calcite (CI) and a dolomite (DP) is investigated in this paper using a thermogravimetric analyser. The tests were non-isothermal at five different heating rates in dynamic atmosphere of air with 0...
| Publié dans: | Environmental technology. - 1993. - 33(2012), 10-12 vom: 16. Juni, Seite 1175-82 |
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| Auteur principal: | |
| Autres auteurs: | , , |
| Format: | Article |
| Langue: | English |
| Publié: |
2012
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| Accès à la collection: | Environmental technology |
| Sujets: | Comparative Study Journal Article Research Support, Non-U.S. Gov't Carbon Dioxide 142M471B3J Calcium Carbonate H0G9379FGK Magnesium I38ZP9992A calcium magnesium carbonate |
| Résumé: | The influence of the partial pressure of carbon dioxide (CO2) on the thermal decomposition process of a calcite (CI) and a dolomite (DP) is investigated in this paper using a thermogravimetric analyser. The tests were non-isothermal at five different heating rates in dynamic atmosphere of air with 0% and 15% carbon dioxide (CO2). In the atmosphere without CO2, the average activation energies (E(alpha)) were 197.4 kJ mol(-1) and 188.1 kJ mol(-1) for CI and DP, respectively. For the DP with 15% CO2, two decomposition steps were observed, indicating a change of mechanism. The values of E(alpha) for 15% CO2 were 378.7 kJ mol(-1) for the CI, and 299.8 kJ mol(-1) (first decomposition) and 453.4 kJ mol(-1) (second decomposition) for the DP, showing that the determination of E(alpha) for DP should in this case be considered separately in those two distinct regions. The results obtained in this study are relevant to understanding the behaviour changes in the thermal decomposition of limestones with CO2 partial pressure when applied to technologies, such as carbon capture and storage (CCS), in which carbon dioxide is present in high concentrations |
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| Description: | Date Completed 06.09.2012 Date Revised 25.11.2016 published: Print Citation Status MEDLINE |
| ISSN: | 1479-487X |