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

• Main Author: Linyan Hu, Sujuan Xie, Qingxia Wang, Shenglin Liu and Longya Xu
• Format: Article
• Language: English
• Published: Taylor & Francis Group 2009-01-01
• Series: Science and Technology of Advanced Materials
• Subjects: FAU; LTA; Composite zeolite; crystallization; sodium concentration
• Online Access: http://www.iop.org/EJ/abstract/1468-6996/10/1/015001
• ISSN: 1468-6996; 1878-5514

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 Al2 O3 4.36 SiO2 : 2.39 (TMA)2 O : β Na2 O : 249.00H2 O). Na + ions alter the phase composition of the product more than TMA+ or OH− ions. When Na2 O concentration [Na2 O] 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 ([Na2 O] 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.