Basic energy characteristics and isotherm of methanol adsorption on Cu2+ZSM-5 zeolite
This paper presents isotherm results and basic (ΔH, ΔF and 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 characteristi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2023-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/95/e3sconf_emmft2023_02006.pdf |
| Summary: | This paper presents isotherm results and basic (ΔH, ΔF and 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. |
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| ISSN: | 2267-1242 |