Thermally Enhanced Acidity for Regeneration of Carbon Dioxide Sorbent

Osamah Alghazwat, Melyse Laud and Yi Liao ()
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Osamah Alghazwat: Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, FL 32901, USA
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

Energies, 2024, vol. 17, issue 17, 1-9

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.

Keywords: CO 2 capture; sorbent regeneration; thermal acidity; Van’t Hoff’s equation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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