Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Zeolite faujasite (FAU), Linde type A (LTA) and FAU) LTA composite have been synthesized using tetramethylammonium cation (TMA(+)) as template, by adjusting only the concentration of Na+ ions in the initial solution (1.00 Al2O3 4.36 SiO2 : 2.39 (TMA)(2)O : beta Na2O : 249.00H(2)O). Na+ ions alter the phase composition of the product more than TMA(+) or OH- ions. When Na2O concentration [Na2O] increases from 0.024 to 0.168, the product gradually changes from pure FAU to pure LTA via the formation of FAU/LTA composite with increasing LTA fraction. Interestingly, the induction periods of FAU and LTA in the FAU/LTA composite zeolite ([Na2O] is 0.072) are both 13 h, quite different from the induction periods of their individual pure phases-45 h for FAU and 4 h for LTA. During the crystallization, the LTA/(FAU+LTA) fraction in the composite zeolite decreases in a nearly linear fashion. Scanning electron microscopy, thermogravimetry and differential thermal analysis indicate some difference between the properties of the FAU/LTA composite zeolite and of the mechanical mixture