ENTROPY AND THERMOKINETICS OF TOLUENE ADSORPTION ON Cu2+ZSM-5 ZEOLITE
Abstract
This paper presents the results of the main (H, F and S) thermodynamic characteristics and the time of establishment of adsorption equilibrium depending on the amount of adsorption of toluene in Cu2+ZSM-5 zeolite. The isotherms and differential heat of adsorption were measured using a system consisting of a universal high-vacuum adsorption unit and a differential modified microcalorimeter of the Tiana-Calve DAK-1-1A type connected to it, which directly gives quantitative and qualitative characteristics of the nature and forces of adsorption interaction. A correlation between the adsorption-energy characteristics was found and the molecular mechanism of toluene adsorption in Cu2+ZSM-5 zeolite was revealed in the entire filling area. It has been determined that the average molar entropy of toluene adsorption in CuZSM-5 zeolite indicates that the mobility of toluene molecules in the zeolite is lower than the liquid phase and is close to the mobility of the solid phase, which indicates a strong inhibition of the mobility of toluene molecules on cations.