Year: 2023
Type: conference-paper
Abstract: This paper presents isotherm results and basic (ΔH, ΔFand ΔS) thermodynamic characteristics of methanol adsorption in Cu2+ZSM-5 zeolite. The trinomial equation of adsorption isotherm by the bulk micropore filling theory (VMOT) is also described. A correlation between adsorption-energy characteristics was found and molecular mechanisms of methanol adsorption in Cu2+ZSM-5 zeolite were revealed in the whole filling region. It was determined that Cu2+cations are located in shielded positions of the crystal lattice of zeolite ZSM-5. Adsorption of methanol molecule leads to the migration of Cu2+cations from the zeolite lattice to the crossings formed by the intersection of straight and zigzag channels and to the formation of ion/molecular complexes of different multiplicity in them. It was found that small polar methanol molecules form high-energy hepta complexes with Cu2+cation and are located in the first coordination sphere in Cu2+ZSM-5 zeolite. It was determined that the average molar entropy (-65 kJ/mol) of methanol adsorption indicates that in the zeolite the mobility of methanol molecules is lower than the liquid phase and close to the mobility of the solid phase.
Source: E3S Web of Conferences
Authors: Oybek Ergashev, Khayot Bakhronov, Khamid Kholmedov, Abror Ganiev, Khasan Karimov, Sarvar Khalilov
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4389476590