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http://dx.doi.org/10.9713/kcer.2019.57.2.253

Deactivation causes of dry sorbents for post-combustion CO2 capture  

Cho, Min Sun (Kyungpook National University)
Chae, Ho Jin (Kyungpook National University)
Lee, Soo Chool (Kyungpook National University)
Jo, Seong Bin (Kyungpook National University)
Kim, Tae young (Kyungpook National University)
Lee, Chul Ho (Kyungpook National University)
Baek, Jeom-In (Korea Electric Power Research Institute)
Kim, Jae Chang (Kyungpook National University)
Publication Information
Korean Chemical Engineering Research / v.57, no.2, 2019 , pp. 253-258 More about this Journal
Abstract
Several materials are used to design the sorbents applied in a fast-fluidized bed process for post-combustion $CO_2$ capture. In this study, $K_2CO_3$-based dry sorbent (KMC) was prepared by using Micro-cell C (MCC), one of the materials used to design the sorbent, and then its $CO_2$ sorption and regeneration properties were evaluated. KMC sorbent showed a low $CO_2$ capture capacity of 21.6 mg $CO_2/g$ sorbent, which is about 22% of the theoretical value (95.4 mg $CO_2/g$ sorbent) even at 1 cycle, and showed a low $CO_2$ capture capacity of 13.7 mg $CO_2/g$ sorbent at 5 cycles. It was confirmed that the KMC sorbent was deactivated due to the formation of a $K_2Ca$ $(CO_3)_2$ phase, resulting from the reaction of the $K_2CO_3$ with the Ca component contained in the MCC. In order to solve the deactivation of sorbent, and KM8 sorbent was prepared by adding the process of calcining the MCC at $850^{\circ}C$. The KM8 sorbent showed a high $CO_2$ capture capacity of 95.2 mg $CO_2/g$ sorbent and excellent regeneration property. Thus, it was confirmed that the deactivation of the sorbent could be solved by adding the calcining step to remove the side reaction causing material.
Keywords
Post-combustion $CO_2$ capture process; Dry sorbent; Calcium; Regeneration; Deactivation;
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