SYNTHESIS OF HIGH SILICA ZEOLITES USING DEEP EUTECTIC SOLVENTS
Abstract
This paper presents the results of exploratory research in the field of synthesis of zeolite type ZSM-5 using deep eutectic solvents (DES) as structure-forming additives. The synthesis of zeolites was carried out by hydrothermal synthesis. As a source of silicon and aluminum, the sodium salt of silicic acid and the aqueous salt (nonahydrate) of aluminum nitrate were used. Binary and triple DES systems were used as structure–forming additives necessary for the initiation of the growth of zeolite crystals: "choline chloride – urea", "pentaerythritol – urea", "pentaerythritol – choline chloride", "urea – choline chloride – pentaerythritol" and "pentaerythritol – urea - boric acid". The study of synthesized materials by IR spectroscopy and X-ray phase analysis showed the success of obtaining zeolites in the presence of all structure–forming additives, with the exception of synthesis with the binary system "pentaerythritol - choline chloride" as a structure-forming additive. Structural parameters were determined for successfully synthesized zeolite samples: the specific surface area, distribution and pore size of the channels. It was found that the synthesis of zeolite in the presence of various DES leads to the formation of more mesoporous zeolites, having a smaller pore size, compared with the previously synthesized comparison zeolite. The study of the morphological features of the surface of zeolites synthesized using different DES showed a significant difference in the nature and shape of elementary zeolite particles. The use of more complex triple DES systems as structure-forming additives leads to the formation of a larger set of different forms of zeolite particles having the same elemental composition. The study of the acid characteristics of the synthesized samples and their comparison with the characteristics of the previously obtained and used zeolite allows us to put forward an assumption about the potential ability of zeolites to exhibit catalytic activity in the composition of catalysts for the processing of hydrocarbons.
For citation:
Korobitsyna L.L., Kozlov V.V., Sholidodov M.R., Velichkina L.M., Barbashin Ya.E., Altunina L.K. Synthesis of high silica zeolites using deep eutectic solvents. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 11. P. 76-84. DOI: 10.6060/ivkkt.20236611.14t.
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