Determination of Ammonia’s Adsorption Properties in NaLSX Zeolite by Calorimetric Method
Year: 2020
Type: article
Abstract: The research of the molecules’ adsorption of different geometric shapes and electronic structures together with zeolites of different composition and structure arouses simultaneous interest in the research of the influence of the chemical nature of the surface of adsorbents on adsorption.Zeolites are porous crystals, their adsorption properties are physicochemical constants, therefore, it is theoretically possible to determine the micropore structure of zeolites and to calculate their interaction with the potential interacting 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. Nevertheless, 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 voids. In order to determine the acidity and basicity properties of the composition, it is necessary to study the laws of adsorption of ammonia molecules. In the determination of ammonia adsorption isotherm, differential temperatures and thermokinetics in NaLSX zeolite was carried out using the method of adsorption calorimetry in a high vacuum adsorption device. They are based on differential molar entropy and free adsorption energy. The adsorption isotherm is fully described by the three-dimensional equation of the theory of volumetric micropore occupancy (VMOT). The average molar integral entropy of ammonia molecule adsorption on NaLSX zeolite is 59.64 Dj/mol*K, indicating a strong localization of ammonia molecules in NaLSX zeolite.
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W3114948355