Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles
[EN] Calcium looping is an emerging high-temperature, energy-efficient, CO2 capture technology using CaO as a regenerable sorbent of CO2 through the reversible carbonation/calcination reaction. The stability of the sorbent plays a key role in the design of these systems. This paper revisits the self-reactivation phenomenon that has been reported for some highly deactivated CaO materials when submitted to repeated carbonation/calcination cycles under certain conditions. Self-reactivation is modelled in this paper as the result of a dynamic balance between the loss of activity in one cycle and the accumulated gain of activity by extended carbonation times, due to a product layer of CaCO3 that keeps building up on all surfaces, controlled by the slow diffusion of CO2. The model describes reasonably well the trends observed for some limestones and conditions. For other limestones and conditions, the carbonation mechanism is more complex and the model does not fit the evolution of the maximum Ca conversion with the number of cycles as well, although the general patterns of selfreactivation are still well reproduced.
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American Chemical Society
2011-03-10
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Subjects: | CO2 capture, Ca-looping, Self-reactivation, |
Online Access: | http://hdl.handle.net/10261/40626 |
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dig-incar-es-10261-406262018-11-15T07:44:14Z Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles Arias Rozada, Borja Abanades García, Juan Carlos Anthony, Edward J. CO2 capture Ca-looping Self-reactivation [EN] Calcium looping is an emerging high-temperature, energy-efficient, CO2 capture technology using CaO as a regenerable sorbent of CO2 through the reversible carbonation/calcination reaction. The stability of the sorbent plays a key role in the design of these systems. This paper revisits the self-reactivation phenomenon that has been reported for some highly deactivated CaO materials when submitted to repeated carbonation/calcination cycles under certain conditions. Self-reactivation is modelled in this paper as the result of a dynamic balance between the loss of activity in one cycle and the accumulated gain of activity by extended carbonation times, due to a product layer of CaCO3 that keeps building up on all surfaces, controlled by the slow diffusion of CO2. The model describes reasonably well the trends observed for some limestones and conditions. For other limestones and conditions, the carbonation mechanism is more complex and the model does not fit the evolution of the maximum Ca conversion with the number of cycles as well, although the general patterns of selfreactivation are still well reproduced. This work is partially supported by the European Commission under the 7th Framework Programme (CaOling project). Peer reviewed 2011-10-05T10:58:56Z 2011-10-05T10:58:56Z 2011-03-10 artículo http://purl.org/coar/resource_type/c_6501 Energy and Fuels 25(4) : 1926-1930(2011) 0887-0624 http://hdl.handle.net/10261/40626 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/241302 http://pubs.acs.org/doi/abs/10.1021/ef200015a open American Chemical Society |
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CO2 capture Ca-looping Self-reactivation CO2 capture Ca-looping Self-reactivation Arias Rozada, Borja Abanades García, Juan Carlos Anthony, Edward J. Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles |
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[EN] Calcium looping is an emerging high-temperature, energy-efficient, CO2 capture
technology using CaO as a regenerable sorbent of CO2 through the reversible carbonation/calcination
reaction. The stability of the sorbent plays a key role in the design of these systems. This paper revisits
the self-reactivation phenomenon that has been reported for some highly deactivated CaO materials
when submitted to repeated carbonation/calcination cycles under certain conditions. Self-reactivation is
modelled in this paper as the result of a dynamic balance between the loss of activity in one cycle and
the accumulated gain of activity by extended carbonation times, due to a product layer of CaCO3 that
keeps building up on all surfaces, controlled by the slow diffusion of CO2. The model describes
reasonably well the trends observed for some limestones and conditions. For other limestones and
conditions, the carbonation mechanism is more complex and the model does not fit the evolution of the
maximum Ca conversion with the number of cycles as well, although the general patterns of selfreactivation
are still well reproduced. |
format |
artículo |
topic_facet |
CO2 capture Ca-looping Self-reactivation |
author |
Arias Rozada, Borja Abanades García, Juan Carlos Anthony, Edward J. |
author_facet |
Arias Rozada, Borja Abanades García, Juan Carlos Anthony, Edward J. |
author_sort |
Arias Rozada, Borja |
title |
Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles |
title_short |
Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles |
title_full |
Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles |
title_fullStr |
Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles |
title_full_unstemmed |
Model for self-reactivation of highly sintered CaO particles during CO2 capture looping cycles |
title_sort |
model for self-reactivation of highly sintered cao particles during co2 capture looping cycles |
publisher |
American Chemical Society |
publishDate |
2011-03-10 |
url |
http://hdl.handle.net/10261/40626 |
work_keys_str_mv |
AT ariasrozadaborja modelforselfreactivationofhighlysinteredcaoparticlesduringco2captureloopingcycles AT abanadesgarciajuancarlos modelforselfreactivationofhighlysinteredcaoparticlesduringco2captureloopingcycles AT anthonyedwardj modelforselfreactivationofhighlysinteredcaoparticlesduringco2captureloopingcycles |
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