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Abstract
In this article, the rapid decay of the CO2 capture capacity of calcined powders derived from Ca(OH)2 is presented. The observed decay is closely related to the calcination conditions of Ca(OH)2. By increasing calcinaion time, the CO2 capture capacity decreases significantly. At 973 K, the decay can cause a 27.3% of CO2 capture capacity loss by 2.5 min increase of calcination time. A higher calcination temperature will decrease the observed decay. In order to well understand the decay process, the characteristics of calcined powders derived from Ca(OH)2, such as pore structure and basicity, were investigated. During the process of CO2 capture of calcined powders from shorter Ca(OH)2 calcination time, a carbonation reaction and Ca(OH)2 decomposition occur simultaneously. Therefore, the diffusion and transportation of steam from the Ca(OH)2 decomposition helps to prevent the formation of an exterior CaCO3 layer, which can result in more thorough carbonation reactions. Furthermore, a preliminary attempt to overcome the observed decay was also studied.