Catalyzed Sintering of Regenerated CaO Induced by Partition Evolution of Calcium Carbonate

Abstract

The partition evolution of parent calcium carbonate (CaCO3) and its effect on the catalyzed sintering of regenerated CaO during calcium looping cycles were investigated. The carbonation reaction rate has a heterogeneous distribution either in the particle radial direction or in the same layer, which causes the partition structure evolution of CaCO3 from overall dense structure to region partition structure. Both the residual and sintering of regenerated CaO were enhanced with the structural evolution of carbonate precursor. Within the first five cycles, an initial structural division of the CaCO3 matrix occurs accompanied by a sharp decrease in the number of mesopores, indicating a dependence of the CO2 capture ability on the structure evolution of the sorbent skeletal.

Review on the modifications of natural and industrial waste CaO based sorbent of calcium looping with enhanced CO2 capture capacity

“…The sintering effect occurs at high calcination temperatures, reducing the carbonation conversion of sorbent inside the carbonator reactor and leading to a high degradation rate. In addition to attrition and the sintering effect, some of the degradations can be related to the closure of pores smaller than 300 nm [ 57 ] during carbonation that does not reopen during the subsequent cycles [ 34 ]. This degradation makes the sorbent unable to maintain the stability of the sorption performance after many cycles.…”

Dual Anti‐Sintering Mechanism of Highly Stable CaO‐Based Sorbent and Enhanced Kinetics

“…Limestone with about 95.7 % CaCO 3 purity from Donggang quarry (Liaoning, China) was used in this research, and the chemical components which were reported in a previous work [46]. Limestone powders in the size ranges of 0.04-0.08 and 0.15-0.18 mm were obtained by sieving.…”