On the modeling of the CO2-catalyzed sintering of calcium oxide

Maya, Juan C., Chejne, Farid and Bhatia, Suresh K. (2017) On the modeling of the CO2-catalyzed sintering of calcium oxide. AIChE Journal, 63 8: 3286-3296. doi:10.1002/aic.15696

Author Maya, Juan C.
Chejne, Farid
Bhatia, Suresh K.
Title On the modeling of the CO2-catalyzed sintering of calcium oxide
Formatted title
On the modeling of the CO2-catalyzed sintering of calcium oxide
Journal name AIChE Journal   Check publisher's open access policy
ISSN 1547-5905
Publication date 2017-03-11
Sub-type Article (original research)
DOI 10.1002/aic.15696
Open Access Status Not yet assessed
Volume 63
Issue 8
Start page 3286
End page 3296
Total pages 11
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Formatted abstract
A comprehensive mathematical model for the CO2-catalyzed sintering of CaO is proposed. It takes into account the mechanisms of surface diffusion and grain boundary diffusion, catalyzed by CO2 chemisorption and dissolution, respectively. In addition, the model proposed here considers the change in pore size distribution during sintering, grain growth, and the densification by lattice diffusion, which is the intrinsic sintering mechanism of the CaO. Model predictions are validated using experimental data on the sintering of two CaO samples, one of them derived from pure CaCO3 and the other from limestone. It is found that impurities in limestone-derived CaO do not significantly affect the CO2 dissolution or chemisorption processes; however, they strongly increase the rate of sintering by lattice diffusion. It is also established that low temperatures and CO2 partial pressures promote the coarsening by surface diffusion, whereas high temperatures and CO2 partial pressures favor densification.
Keyword Calcium oxide
Carbon dioxide
Mathematical modeling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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