Document Detail


Thermal decomposition kinetics of Brazilian limestones: effect of CO2 partial pressure.
MedLine Citation:
PMID:  22856287     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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.
Authors:
Ivonete Avila; Paula M Crnkovic; Fernando E Milioli; Kai H Luo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental technology     Volume:  33     ISSN:  0959-3330     ISO Abbreviation:  Environ Technol     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-08-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9884939     Medline TA:  Environ Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1175-82     Citation Subset:  IM    
Affiliation:
Group of Thermal and Fluids Engineering, School of Engineering of São Carlos, University of São Paulo, São Carlos, Brazil. iavila@sc.usp.br
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