Influence of morphology, porosity and crystal structure of CaCO₃ precursors on the CO₂ capture performance of CaO-derived sorbents
2013
Olivares-Marín, M. | Cuerda-Correa, E.M. | Nieto-Sánchez, A. | Garcia, S. | Pevida, C. | Román, S.
In this study, several different CaCO₃ samples both natural and synthetic, showing diverse physico-chemical characteristics (particle morphology, crystal structure and porosity) were used as precursors of CaO-based sorbents for the capture of CO₂. In order to identify the most favorable CaCO₃ properties for a high stability and optimal CO₂ uptake by CaO-derived sorbents, both series of materials were characterized using the following analytical techniques: X-ray diffraction, N₂ adsorption and scanning electron microscopy. Moreover, the main differences in chemical composition, particle morphology and sorbent porosity of the CaO-based materials were correlated to the maximum CO₂ uptake and loss-in-capacity after several carbonation/calcination cycles. The results indicate that the crystal structure of CaCO₃parent samples strongly affects the physical properties of the calcium oxide formed during the calcination step, significantly influencing the maximum CO₂ uptake. The agglomeration of CaO particles after the calcination of the CaCO₃ precursors controlled to a certain extent the carbonation rate. However, this factor could not be correlated with the loss of activity of the CaO-derived sorbents in tests carried out over consecutive carbonation/calcination cycles.
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