CO2 complexation with cyclodextrins

Cecilie Høgfeldt Jessen; Jesper Bendix; Theis Brock Nannestad; Heloisa Bordallo; Martin Jæger Pedersen; Christian Marcus Pedersen; Mikael Bols

doi:10.3762/bjoc.19.78

CO₂ complexation with cyclodextrins

Beilstein J Org Chem. 2023 Jul 17:19:1021-1027. doi: 10.3762/bjoc.19.78. eCollection 2023.

Authors

Cecilie Høgfeldt Jessen¹, Jesper Bendix¹, Theis Brock Nannestad¹, Heloisa Bordallo¹, Martin Jæger Pedersen¹, Christian Marcus Pedersen¹, Mikael Bols¹

Affiliation

¹ Department of Chemistry & Niels Bohr Institute, University of Copenhagen, 2100 København Ø, Denmark.

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 K_g of 0.18-1.2 bar^-1 (7-35 M^-1) with per-O-methyl α-cyclodextrin having the highest CO₂ affinity.

Keywords: carbon dioxide; crystals; cyclodextrin; gas binding.

Grants and funding

800 MHz NMR data was recorded at cOpenNMR an infrastructure facility funded by the Novo Nordisk Foundation (#NNF18OC0032996). We also thank the Novo Nordisk foundation for financial support through NMR infrastructure grant (NNF21OC0067315) and project grant (NNF21OC0071886), and the Carlsberg foundation for infrastructure grant CF21-0152.