CO₂ complexation with cyclodextrins

Abstract

Carbon dioxide (CO2) emissions from industrial processes, power generation, and transportation contribute significantly to global warming and climate change. Carbon capture and storage (CCS) technologies are essential to reduce these emissions and mitigate the effects of climate change. Cyclodextrins (CDs), cyclic oligosaccharides, are studied as potential CO2 capture agents due to their unique molecular structures and high selectivity towards CO2. In this paper we have investigated binding efficiency of a number of cyclodextrins towards CO2. It is found that the crystal structure of α-cyclodextrin with CO2 has a 1:1 stoichioimetry and that a number of simple and modified cyclodextrins bind CO2 in water with a Kg of 0.18–1.2 bar−1 (7–35 M−1) with per-O-methyl α-cyclodextrin having the highest CO2 affinity.

Mechanochemical synthesis of β-cyclodextrin urea derivatives under reactive CO2 atmosphere by Staudinger aza-Wittig reaction

“…Therefore, a high pressure of gaseous reactant is no longer necessary, and a nearly stoichiometric quantity of CO 2 is sufficient to achieve high yields (Table 3). Recently, Bols and co. 23 presented a compelling demonstration of the capacity of certain cyclodextrin derivatives to form complexes with CO 2 . This study was distinguished by the successful crystallization of specific complexes involving cyclodextrin derivatives and CO 2 , providing robust confirmation of the existence of these associations in the solid phase.…”

Comprehensive Review and Perspectives of CO2 Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

“…In addition, cyclodextrins (CDs) are cyclic oligosaccharides notably studied in the context of carbon capture and storage (CCS) due to their unique structure, utilized as nanostructured encapsulation techniques for controlled CO 2 hydrate storage owing to their distinctive molecular structure featuring a hydrophobic cavity and hydrophilic exterior. 131 This structure allows CDs to form inclusion complexes with various guest molecules, including CO 2, by encapsulating CO 2 molecules within their hydrophobic cavities, which can be particularly valuable in creating controlled CO 2 hydrate storage systems. 125 This encapsulation process helps regulate the release and absorption of CO 2 , making CDs promising candidates for applications in carbon capture and storage technologies aimed at mitigating climate change.…”