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Thermal decomposition kinetics of Brazilian limestones: effects of CO2 partial pressure

Thermal decomposition kinetics of Brazilian limestones: effects of CO2 partial pressure
Thermal decomposition kinetics of Brazilian limestones: effects 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% and 15% carbon dioxide (CO2). In the atmosphere without CO2, the average activation energies (E ?) 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 ? 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 ? 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
calcination, limestone, thermal decomposition, carbon dioxide, activation energy
0959-3330
Luo, Kai H.
86f52a13-fdcd-40e4-8344-a6fe47c4e16b
Avila, Ivonete
9176ba32-b103-4514-a6bd-1e741a63066d
Crnkovic, Paula M.
050303ad-3e9b-490a-bc3b-6fb517a7d54e
Milioli, Fernando E.
ec3b83db-27a2-464d-b7cc-44dfc0dc991b
Luo, Kai H.
86f52a13-fdcd-40e4-8344-a6fe47c4e16b
Avila, Ivonete
9176ba32-b103-4514-a6bd-1e741a63066d
Crnkovic, Paula M.
050303ad-3e9b-490a-bc3b-6fb517a7d54e
Milioli, Fernando E.
ec3b83db-27a2-464d-b7cc-44dfc0dc991b

Luo, Kai H., Avila, Ivonete, Crnkovic, Paula M. and Milioli, Fernando E. (2011) Thermal decomposition kinetics of Brazilian limestones: effects of CO2 partial pressure. Environmental Technology. (doi:10.1080/09593330.2011.618930).

Record type: Article

Abstract

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 ?) 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 ? 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 ? 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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More information

e-pub ahead of print date: 6 September 2011
Keywords: calcination, limestone, thermal decomposition, carbon dioxide, activation energy
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 334462
URI: http://eprints.soton.ac.uk/id/eprint/334462
ISSN: 0959-3330
PURE UUID: 3a866f94-fe52-4fd5-a686-46fddeff24be

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Date deposited: 09 Mar 2012 15:05
Last modified: 16 Jul 2019 22:10

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