Abstract:

The carbonation characteristics and the decline of reactivity for recycle Ca-based CO₂ absorbent were investigated. The microstructure, pore radius and specific surface area of the absorbent changed with the number of cycles, leading to the decline of the absorbent reactivity. The results show that, the lamellar structure in the absorbent disappears, which changes to bigger cubic crystals, and most apertures were blocked. It reduces the specific surface area and total cumulative volume and changes the distribution of pore radius, and then the reactivity of Ca-based CO₂ absorbent and the absorption capability decline as the number of cycles increases.