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Thermally Enhanced Acidity for Regeneration of Carbon Dioxide Sorbent

Author

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  • Osamah Alghazwat

    (Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, FL 32901, USA
    School of Arts and Sciences, American International University, Saad Al Abdullah, East of Naseem Block 3, Aljahra, Kuwait)

  • Melyse Laud

    (Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, FL 32901, USA)

  • Yi Liao

    (Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, FL 32901, USA)

Abstract

The thermal regeneration of CO 2 sorbent is the most energy-consuming step in the CO 2 -capturing process. Although the addition of an acid can induce CO 2 release, it does not regenerate the sorbent because the acid forms a salt with the basic sorbent and diminishes its capability for capturing CO 2 . In this work, a novel approach based on thermally enhanced acidity was studied. This approach utilizes an additive that does not affect the sorbent at room temperature, but its acidity significantly increases at elevated temperatures, which assists the thermal release of CO 2 . M-cresol was added to an aqueous solution of morpholine. The CO 2 capture and release of the mixture were compared to those of a control solution without m-cresol. The amounts of carbamate, bicarbonate, and unreacted morpholine were quantitatively determined using 1 H NMR and weight analysis. The results showed that m-cresol did not affect the reactivity of morpholine in the formation of carbamate with CO 2 at room temperature. At elevated temperatures, the acidity of m-cresol increased according to Van’t Hoff’s equation, which resulted in a significantly higher rate of CO 2 release than that of the control. Given the low cost of m-cresol and its derivatives, this approach could lead to practical technology in the near future.

Suggested Citation

  • Osamah Alghazwat & Melyse Laud & Yi Liao, 2024. "Thermally Enhanced Acidity for Regeneration of Carbon Dioxide Sorbent," Energies, MDPI, vol. 17(17), pages 1-9, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4279-:d:1465050
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    References listed on IDEAS

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    1. Shakerian, Farid & Kim, Ki-Hyun & Szulejko, Jan E. & Park, Jae-Woo, 2015. "A comparative review between amines and ammonia as sorptive media for post-combustion CO2 capture," Applied Energy, Elsevier, vol. 148(C), pages 10-22.
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