Synthesis Characteristics Of Nalta And Calta Molecular Sieves Via Chemical Activation And Hydrothermal Methods
Keywords:
NaLTA, CaLTA, zeolites, mechanochemical activation, hydrothermal synthesis, crystalline phase, microporosity, selective adsorption.Abstract
This scientific article presents the synthesis technology of molecular sieve structures of the LTA-type zeolites modified with sodium and calcium cations – NaLTA and CaLTA – via chemical activation and hydrothermal methods. The study explores the mechanochemical activation of raw materials using impact-vibration milling, their preparation for crystallization, and the mechanisms of phase structure formation. The resulting microporous frameworks were evaluated using physicochemical characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller surface analysis (BET), and infrared spectroscopy (IR), with a particular focus on determining their adsorption properties.
References
Breck, D. W. Zeolite Molecular Sieves. Wiley-Interscience, 1974.
Davis, M. E. "Ordered Porous Materials for Emerging Applications." Nature, 2002, 417, pp. 813–821.
Pavlov, M. L., Ivanov, A. I., Kuznetsova, T. A. "Zeolite NaLTA Synthesis from Kaolinite." Journal of Applied Chemistry, 2011, 84(6), pp. 973–979.
Barrer, R. M. Zeolites and Clay Minerals as Sorbents and Molecular Sieves. Academic Press, 1978.
Petrovich, B., Smirnov, V., Yaroslavtsev, A. "Thermodynamic Analysis of Zeolite Formation." Journal of Physical Chemistry B, 2004, 108(12), pp. 3862–3868.
Piccione, P. M., Yang, S., Chmelka, B. F. "Entropy-Driven Synthesis in Microporous Materials." Chemistry of Materials, 2002, 14(2), pp. 882–891.
Zones, S. I. "Synthetic Pathways for Molecular Sieves." Microporous Materials, 2000, 12, pp. 1–9.
Flanigen, E. M., Khatami, H., Szymanski, H. A. "Synthesis and Structure of LTA-Type Zeolites." Journal of Catalysis, 1985, 95, pp. 201–214.
