Abstract

The full thermodynamic characteristics of CO2 and CH3OH adsorption on the mineral illite were obtained using the adsorption - calorimetric method. The crystal chemistry of illite was studied using the polar CH3OH molecule and the quadrupole CO2 molecule as a molecular probe. The mechanism of adsorption of these molecules, the conformation of the resulting ion/molecular complexes, and the thermokinetics of adsorption were revealed. The adsorption isotherms are studied and described by their corresponding equations. The molecular mechanism of CO2 and CH3OH adsorption on illite was studied in the entire filling area. It has been established that under the influence of a polar methanol molecule, K+ migrate to the basal and lateral faces of illite, filling vacant holes with six-dimensional CH3OH/K+ complexes of illite, the state of molecules on the surface is close to liquid - like. The process of migration of cations is completely reversible. It was found that the adsorption of a quadrupole CO2 molecule on illite does not lead to the migration of cations. Adsorption proceeds on K+ cations, which occupy the basal one third of the illite surface.