1. Introduction - Firenze University Press

pore size distribution was observed. Particularly, the formation of larger pores (100 nm) were
detected which permits CO2 to get the inner core of the particle with a major CaO utilization
whereas smaller pores play a key role to the rapid carbonation of the sorbent material. Then the
experimental results presented in the remainder of this work are collected from the sorbent obtained
from the hydrated precursor.
Fig. 7. Carbon capture capacity of 85% CaO sorbent when subjected to different regeneration
condition: (a) mild regeneration: 900 °C, 14/86 %v (CO2/ N2); (b) moderately severe regeneration:
1000 °C, 14/86 %v (CO2/ N2); (c) severe regeneration: 1000 °C, 86/14 %v (CO2/ N2).
Fig 7 shows the influence of regeneration condition on the 85% CaO sorbent activity. In particular,
you can see that with the increase of both temperature and the amount of CO2 in the atmosphere
during the sorbent regeneration the self reactivation period decreases. When the sorbent is
regenerated with mild condition, the self reactivation period is extended up to ~60 th (Fig 7 (a)). As
reported in Fig. 7 (b), if the regeneration temperature is increased up to 1000 °C the self reactivation
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