Abstract
A study of the CaOSO 2 reaction at 573 K in a thermobalance has been performed both in the absence and in the presence of O 2, with samples of eight different limestones and commercial CaCO 3. Limestones and CaO obtained from it were both widely characterized. The “classical” textural parameters (BET surface area, pore volume, etc.) of the limestone or the CaO do not explain the behaviour of the CaOSO 2 system at 573 K, i.e., the SO 2 retention degree at 573 K. On the contrary, a good correlation has been obtained between the SO 2 retention degree at 573 K and the new parameter introduced in the present study: the specific surface area of CaO, determined by means of the CO 2 chemisorption method at 573 K. In addition, the results obtained confirm and support the interpretation given for previous results, so it has been proved that CaSO 3 formed a 573 K is restricted at the surface of the particles and that at 573 K, both in the absence and in the presence of O 2, the species formed is CaSO 3.
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