DIFFERENTIAL HEAT ADSORPTION AND MECHANISM OF TOLUENE VAPOR ON ZSM-5 TYPE ZEOLITES

Ergashev O.; Bakhronov Kh.; Esonkulova N.; Ahkmadov M.

doi:10.5281/zenodo.12571713

DIFFERENTIAL HEAT ADSORPTION AND MECHANISM OF TOLUENE VAPOR ON ZSM-5 TYPE ZEOLITES

27.06.2024 International Scientific Journal "Science and Innovation". Series A. Volume 3 Issue 6

Ergashev O., Bakhronov Kh., Esonkulova N., Ahkmadov M.

Abstract. This article presents the results obtained by the adsorption-calorimetric method of differential heat and the mechanism of adsorption of toluene on ZSM-5 type zeolites with copper and cesium cations. To measure isotherms and differential heat of adsorption, a system was used consisting of a universal high-vacuum adsorption unit and a differential modified microcalorimeter of the Tiana-Calvé type, DAK-1-1A, connected to it, which directly gives quantitative and qualitative characteristics of the nature and forces of adsorption interaction. A correlation was found between the adsorption-energy characteristics and the molecular mechanism of toluene adsorption in Cs3.17ZSM-5 and Cu1.7ZSM-5 zeolites was revealed throughout the entire filling region. Toluene, adsorbed in the Cs3.17ZSM-5 zeolite, is located in the first coordination sphere with the Cs+ cation, forming dimer-toluene complexes; in the Cu1.7ZSM-5 zeolite, it is located in the first coordination sphere with the Cu2+ cation, forming dimer-toluene complexes. This work shows how calorimetric data can be used to complement crystal structure results and detect subtle adsorbent/adsorbate interactions at the molecular level.

Keywords: adsorption, heat of adsorption, temperature, free energy, entropy, microcalorimeter, toluene, ammonia.

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