Effect of Synthesis Conditions on the Properties of Nanocrystalline Faujasites

Knyazeva, E.E.; Yakimov, A.V.; Shutkina, O.V.; Konnov, S.V.; Panov, A.V.; Kleimenov, A.V.; Kondrashev, D.O.; Golovachev, V.A.; Ivanova, I.I.

Авторы: Knyazeva E.E., Yakimov A.V., Shutkina O.V., Konnov S.V., Panov A.V., Kleimenov A.V., Kondrashev D.O., Golovachev V.A., Ivanova I.I.
Журнал: Petroleum Chemistry
Том: 56
Номер: 12
Год издания: 2016
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 1168
Последняя страница: 1172
DOI: 10.1134/S0965544116120069
Аннотация: The effect of crystallization parameters on the properties of nanocrystalline zeolites Y has been studied to optimize the synthesis conditions. Zeolites Y are prepared by the three-stage hydrothermal crystallization with a gradual rise in synthesis temperature from 25 to 60°C using the Na2O/SiO2 ratio in the reaction mixture and the number and duration of individual synthesis stages as variable synthesis parameters. It has been shown that an increase in the Na2O/SiO2 molar ratio in the reaction mixture above 9.6 leads to a change in the crystallization selectivity and causes formation of zeolite X with a crystal size of 200 nm as a crystalline product. An increase in the duration of the synthesis stage at 60°C is accompanied by increase in the crystal size and entails formation of an analcime impurity phase. A decrease in the duration of reaction mixture aging stages at 25 and 38°C leads to an increase in the zeolite Y nanocrystal sizes and a decrease in the crystalline product yield. It has been found that a pure zeolite Y phase with a nanocrystal size of 320–350 nm and a SiO2/Al2O3 ratio of 3.6–4.2 is formed during the three-stage synthesis from a (7.2–9.6)Na2O ⋅ Al2O3 ⋅ 14.4 SiO2 ⋅ 290 H2O reaction mixture with a yield of 0.60–0.88 g/g of reaction mixture.
Добавил в систему: Якимов Александр Вячеславович

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Effect of Synthesis Conditions on the Properties of Nanocrystalline Faujasitesстатья