Science Daily  May 6, 2021 Researchers in Japan designed an ion-exchanging method using an A-type zeolite (silicon/aluminum ratio of 1) because of its appropriate pore size for adsorbing CO2. The alkaline-earth ion exchange imparted a large electric field strength that, supposedly, acted as a driving force for the adsorption. They chose a doubly charged calcium ion as the exchange ion since it allowed for the greatest amount of adsorption. To investigate the underlying adsorption mechanism, they carried out far-IR measurements and backed them up with density functional theory calculations. It showed a distinct shift towards longer wavelengths following CO2 adsorption. […]