Effects of Seeding on the Formation of Large NaX Zeolite Crystals
The problem with zeolite crystals synthesized by conventional methods is that they are extremely small: their size typically varies 2 and 8 µm, To better define the structure of a zeolite, scientists need to grow crystal that are 100 to 1000 times larger. In this work, large crystals zeolite NaX with a uniform size of 50µm were grown by a continuous crystallization method from seed crystals (5-10µm) formed in a mother solution with the 3.5Na2O : Al2O3 : 2.1SiO2 : 1000H2O composition. In order to grow zeolite NaX crystals to an appropriate size by the continuous method, the mother solution was fed into an autoclave a solution with various seed contents (3 - 20wt%); the autoclave has at 90°C and the solution was added after 7, 12, 16, 19 and 24 days or at 100°C after 7 and 9 days.
Omer Van der Biest, Michael Gasik, Jozef Vleugels
I. J. Kim and H. J. Lee, "Effects of Seeding on the Formation of Large NaX Zeolite Crystals", Materials Science Forum, Vols. 492-493, pp. 287-292, 2005