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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Soo Yeong In & Ji Hwan Min & Jae Chang Kim & Soo Chool Lee, 2024. "Deactivation Patterns of Potassium-Based γ-Alumina Dry Sorbents for CO 2 Capture," Sustainability, MDPI, vol. 16(12), pages 1-13, June.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:12:p:5117-:d:1415796
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