CO2 uptake/retention/release by an iron cation-exchanged clay mineral

Previously our group found, that the synthetic clay mineral Ni-Fluorohectorite (Ni-Hec, where Ni2+ is the charge-compensating cation in the clay interlayer) is competitive with alternative materials (MOFs, activated carbon etc.) with respect to CO2 volumetric adsorption capacity. It was also recently demonstrated that the CO2 adsorption mechanism in Ni-Hec is due to an intercalated nickel hydroxide species, and that Ni-Hec with lower charge layer adsorbs more CO2 and at lower pressure compared to higher layer charges. Recently we in addition found that Fe3+ or Fe2+ (instead of Ni2+) demonstrate CO2 interaction similar to Ni-Hec. In this proposed experiment we want to do a detailed temperature-pressure study of Fe-Hec powders. Fe is particularly interesting here because it is much more abundant and available than Ni and has much less environmental concerns. The experiment will study prepared Fe-Mt powder samples.