Solid sorbents that can selectively capture CO2 are a preferable alternative to surpass the limitations of scrubbing liquid amine technology. To understand the CO2 capture mechanisms of solid sorbents, it is crucial to resort to molecular-level insights. In this study, ssNMR spectroscopy was used to assess CO2 adsorption on amine-modified silicas at different pressures and used to quantitatively discriminate between distinct physis- and chemisorbed CO2 species, which is a remarkable advantage over any other conventional adsorption assessment techniques.
