Unravelling moisture-induced CO₂ chemisorption mechanisms in amine-modified sorbents at the molecular scale.

ABSTRACT: This work entails a comprehensive solid-state NMR and computational study of the influence of water and CO₂ partial pressures on the CO₂-adducts formed in amine-grafted silica sorbents. Our approach provides atomic level insights on hypothesised mechanisms for CO₂ capture under dry and wet conditions in a tightly controlled atmosphere. The method used for sample preparation avoids the use of liquid water slurries, as performed in previous studies, enabling a molecular level understanding, by NMR, of the influence of controlled amounts of water vapor (down to ca. 0.7 kPa) in CO₂ chemisorption processes. Details on the formation mechanism of moisture-induced CO₂ species are provided aiming to study CO₂ : H₂O

SUBMITTER: Sardo M 

PROVIDER: S-EPMC8459418 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature