Basic thermodynamic characteristics of toluene adsorption in Cu²⁺ZSM-5 Zeolite

This paper presents the results of isotherms and basic (ΔH, ΔF ΔS) thermodynamic characteristics toluene adsorption in CuZSM-5 zeolite. For measurements differential heat adsorption, a system consisting universal high-vacuum unit an attached modified Tian-Calve microcalorimeter DAC-1-1A was used to provide direct quantitative qualitative nature forces interaction. The correlation between adsorption-energy wasfound molecular mechanismof zeolite whole filling region revealed. Toluene adsorbed is located first coordination sphere with Cu 2+ cation, forming two-dimensional complexes. It found that charge density significantly affects mechanism, energy number molecules. determined average molar entropy CuZSM5 indicates mobility molecules below liquid phase close solid phase, indicating on cations strongly inhibited. work shows how calorimetric data can be complement crystal structure detect subtle adsorbent/adsorbate interactions at level.