COMPARATIVE ANALYSIS OF THE PROPERTIES OF LTA TYPE ZEOLITE DEPENDING ON THE PRODUCTION METHOD: HYDROTHERMAL AND ULTRASONIC
Abstract
The aim of the work was to establish the main parameters of the study of the use of ultrasound at the stage of synthesis in search of the physicochemical properties of the LTA type zeolite with the hydrothermal method of production. A main condition for the synthesis of this zeolite is the presence of precursors, namely aluminates and cubic sodium aluminosilicates. Metakaolin, solid sodium hydroxide and aluminum oxide are used as raw materials for the synthesis of zeolite. Ultrasonic treatment is carried out at a frequency of 22 kHz and a frequency of 8 µm at the end of the concentrator for 10 min. The industrial analogue was synthesized according to TU 2163-005-21742510-2004. In this work, ammonia is used as a probe to study the acid–base properties of zeolite structures. The choice of ammonia is due to the high degree of bases, which makes it possible to determine not only strongly acidic centers, but also to combine centers that determine the size of molecules. Dynamic activity in terms of water parameters at breakthrough concentration is observed in the flow protocol. The particle size of zeolites is measured by scanning electron microscopy. It was found that in the sample synthesized using ultrasound, the concentration of exchangeable sodium cations is 2.5 times higher than in the hydrothermal analogue and is 80 and 30 µg-eq/100 g, respectively. The strength and number of acid sites of the synthesized zeolites were determined by the method of thermally programmed desorption of ammonia. For the synthesized LTA zeolite, its values are in the range of 0.06 1019 U/m2, for the industrial analogue it is lower by 5-10% and rarely 0.05 1019 U/m2. Using the data on the kinetics of ammonia desorption at various heating rates, the values of activation energy for ammonia desorption were calculated. The results lie in the range from 18.26 to 74.27 kJ/mol. The study of acid-base properties showed a more developed surface of the zeolite obtained by the ultrasonic method, which explains the greater acidity and activation energy.
For citation:
Gordina N.E., Borisova T.N., Klyagina K.S., Rumyantsev R.N., Prozorov D.A. Comparative analysis of the properties of LTA type zeolite depending on the production method: hydrothermal and ultrasonic. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2022. V. 65. N 9. P. 90-96. DOI: 10.6060/ivkkt.20226509.6633.
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