Deactivation Patterns of Potassium-Based γ-Alumina Dry Sorbents for CO 2 Capture

Soo Yeong In, Ji Hwan Min, Jae Chang Kim () and Soo Chool Lee ()
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Soo Yeong In: Department of Chemical Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
Ji Hwan Min: Department of Chemical Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
Jae Chang Kim: Department of Chemical Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
Soo Chool Lee: Research Institute of Advanced Energy Technology, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea

Sustainability, 2024, vol. 16, issue 12, 1-13

Abstract: Gamma-alumina (γ-Al 2 O 3 ) is an essential support material in dry sorbents used to capture CO 2 from flue gas. This study explores the deactivation of potassium-based γ-Al 2 O 3 sorbents due to by-products such as KAl(CO 3 )(OH) 2 during CO 2 capture. We synthesized sorbents with K 2 CO 3 loadings of 5, 10, 20, and 30 wt% and subjected them to repeated capture and regeneration cycles. The results show significant variations in the deactivation degree: the sorbent with 5 wt% K 2 CO 3 exhibited a 100% deactivation rate, while the 30 wt% variant showed a markedly reduced rate of 44.6%. These findings highlight the impact of the formation of KAl(CO 3 )(OH) 2 at the interface between K 2 CO 3 and γ-Al 2 O 3 on sorbent deactivation. An equation that can be used to predict the final CO 2 capture capacity based on the ratio of active material to support was proposed using these results.

Keywords: CO 2 capture; sorbent; potassium carbonate; γ-Al 2 O 3; KAl(CO 3 )(OH) 2; CCS (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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