Synthesis and Characterization of Large NaX Zeolite Crystals by Continuous Crystallization
NaX zeolite crystals of 50 µm were grown by a continuous crystallization with seed crystal (10 ㎛) in a mother solution having a 3.5Na2O : Al2O3 : 2.1SiO2 : 1000H2O composition. The seed crystal morphology of NaX zeolite shows that an octahedron is formed composed of 8 equilateral triangles which have an average lattice constant of a = 24.9911 Å with a SiO2/Al2O3 molar ratio of 2.1~2.4. In order to grow crystals of zeolite X to an appropriate size by the continuous method, the mother solution was supplied with various seed contents (3~20 wt%) in an autoclave at 90°C after 7, 12, 16, 19 and 24 days.
Omer Van der Biest, Michael Gasik, Jozef Vleugels
H. J. Lee et al., "Synthesis and Characterization of Large NaX Zeolite Crystals by Continuous Crystallization ", Materials Science Forum, Vols. 492-493, pp. 731-736, 2005