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Abstract
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The behavior of the carbonation reaction of the calcined Cadomin limestone used for CO 2 capture is described
using the grain model and the changing grain size (CGS) model. To calculate the overall conversion over time, the mathematical
modeling was solved semianalytically. The overall sorbent conversion obtained with the CGS model showed better agreement
with the experimental data than the results obtained using the grain model. In the CGS model, the physical structure of the
sorbent particle changes during the reaction. The CGS model was modi ? ed by considering a variable di ? usion coe ? cient of the
gaseous reactant through the development of the product layer. The modeling results showed the positive e ? ects of increasing
the reaction temperature and particle porosity on the rate of carbonation reaction. However, the rate of carbonation reaction
decreased by increasing the sorbent particle size. Moreover, the modeling results demonstrated an initial kinetic control stage
which was followed by a di ? usion control step in the carbonation reaction of the calcined Cadomin limestone.
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