Abstract
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 room temperature 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.
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References
Larsen, S.C., J. Phys. Chem. C, 2007, vol. 111, p. 18464.
Vuong, G.-T., Hoang, V.-T., Nguyen, D.-T., and Do, T.-On., Appl. Catal., A, 2010, vol. 382, p. 231.
Awala, H., Gilson, J.-P., Retoux, R., Boullay, P., Goupil, J.-M., Valtchev, V., and Mintova, S., Nat. Mater., 2015, vol. 14, p. 447.
Song, W., Grassian, V.H., and Larsen, S.C., Chem. Commun., 2005, p. 2951.
World Patent 2008/0538398 A1, 2008.
Holmberg, B.A., Wang, H., and Yan, Y., Micropor. Mesopor. Mater., 2004, vol. 74, p. 189.
Yin, H., Liu, X., Yao, Y., and Zhou, T., J. Porous Mater., 2015, vol. 22, p. 29.
Cui, Q., Zhou, Y., Wei, Q., Tao, X., Yu, G., Wang, Y., and Yang, J., Catal. Energy Fuels, 2012, vol. 26, p. 4664.
Gao, S., Kegler, J.K., Merrel, L.L., and Ehndzivajn, F.J., RF Patent 2327520, 2005.
Huang, Y., Wang, K., Dong, D., Li, D., Hill, M.R., Hill, A.J., and Wang, H., Micropor. Mesopor. Mater., 2010, vol. 127, p. 167.
Kim, Y.C., Jeong, J.Y., Hwang, J.Y., Kim, Sh.D., and Kim, W.J., J. Porous Mater., 2009, vol. 16, p. 299.
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Original Russian Text © E.E. Knyazeva, A.V. Yakimov, O.V. Shutkina, S.V. Konnov, A.V. Panov, A.V. Kleimenov, D.O. Kondrashev, V.A. Golovachev, I.I. Ivanova, 2016, published in Nanogeterogennyi Kataliz, 2016, Vol. 1, No. 2, pp. 166–171.
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Knyazeva, E.E., Yakimov, A.V., Shutkina, O.V. et al. Effect of synthesis conditions on the properties of nanocrystalline faujasites. Pet. Chem. 56, 1168–1172 (2016). https://doi.org/10.1134/S0965544116120069
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DOI: https://doi.org/10.1134/S0965544116120069