Mahdieh Asadolahi - Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran,
hossein kazemian - R&D Lab. of SPAG Co., Technology incubator, Sci & Technol. Park of Tehran University, Tehran, Iran,
dariush bastani - Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran,

It has been recognized that several synthesis parameters affect the crystallization routes and kinetics in zeolites syntheses .This study indicates that how the aging time, hydrothermal reaction temperature ,inorganic and organic cations( pH and content of cation) affect significantly the final phases when Na-Y are synthesized in the presence of TMA+. Also a method for the preparation of colloidal zeolite Y in high yields is presented. Sodium was added to a colloidal zeolite Y synthesis mixture at varying times during the synthesis to increase the Na2O/Al2O3 ratio to levels that normally favour the crystallization of zeolite A. A two-stage varying-temperature synthesis method was used to determine the nucleation period of colloidal zeolite Y. Nanocrystalline zeolite Y, were synthesized in high yield by periodically removing nanocrystals from the synthesis solution and recycling the unused reagents, including the template and T-atom sources.

Nanozeolite Na-Y, Aging time, Alkalinity, Varing-temperature, Midsynthesis addition, Multistep synthesis