Online ISSN: 2515-8260

Keywords : isotherm

Isotherms, Differential Heats Of Benzene Adsorption in zeolites LiLSX and NaLSX

Abdurakhmonov Eldor Baratovich; Rakhmatkarieva Firuza Gayratovna; Xudoyberganov Mansur Saburovich; Ergashev Oybek Karimovich

European Journal of Molecular & Clinical Medicine, 2021, Volume 8, Issue 1, Pages 628-639

The study of molecules adsorption of different geometric and electronic structure by zeolites of different composition and structure is of great interest to study the effect on the adsorption of chemical nature of adsorbents surface. Zeolites are porous crystals, so the micropore structure of zeolites is determined with high accuracy, their adsorption properties are physical-chemical constants, which can be calculated theoretically based on the calculation of the potential interaction energy adsorbate-adsorbate and adsorbate-adsorbent in zeolites. These data are of great interest for the development of the theory of adsorption forces and intermolecular interactions. However, the calculation of the potential energy of adsorption is difficult due to the complexity of the crystal structure and the potential field in the zeolite channels. The high benzene content degrades the environmental and technological properties of fuels. To select a highly efficient sorbent for dearomatization of fuel, studies of regularities of benzene adsorption in various zeolites are necessary. The isotherm, differential heats of benzene adsorption in zeolites LiLSX and NaLSX at 303K were measured using the adsorption calorimetry method. The adsorption isotherm is quantitatively reproduced by VOM theory equations.

Adsorption Energetics In Zsm-5 Zeolites

Kuldasheva Shakhnoza Abdulazizovna; Yakubov Yuldosh Yusupboyevich; Abdulhaev Tolibjon Dolimjonovich; Rakhimova Latofat Sobirjonovna

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 7, Pages 887-901

This article highlights the study on the determination of differential heat, isotherm, thermokinetics and entropy of water, carbon dioxide, normal heptane, benzene, methanol, ethanol adsorption on ZSM-5 zeolites, using adsorption-calorimetric method at a temperature of 303 K. The type and number of formed ion-molecular complexes, as well, the mechanism of adsorption of the studied molecules were ascertained. In the zeolite structure, thermokinetics of adsorption and the discovery of the migration laws of exchange cations are considered the adsorption energy of gases and vapors in a flawless zeolite. From the beginning to the saturation, the adsorption isotherm was described by the two- and three-term mathematical equations of STMP.