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Indexed by:会议论文

Date of Publication:2013-11-03

Included Journals:EI、CPCI-S

Volume:609-610

Page Number:288-+

Key Words:Nanosized NaY zeolite; dynamic hydrothermal method; seed-gel; alkalinity; framework SiO2/Al2O3 ratios

Abstract:Nanosized NaY molecular sieves with high crystallinity was synthesized using sodium silicate solution (industrial water glass) without the presence of additive via dynamic hydrothermal method. The influences of aging time of the seed-gel, the temperature and route of gelation, and the alkalinity of the feed-stock gel on the grain size, relative crystallinity and framework SiO2/Al2O3 ratios of NaY nanoparticles were investigated by XRD(X-ray diffraction, XRD), SEM(Scanning electron microscope, SEM) and TEM(Transmission electron microscope, TEM). The results shown that the grain size could be effectively controlled by adding seed-gel of aging at 20 degrees C for 4 days, and adopting the gelation route of putting sodium silicate solution into NaAlO2 and NaOH mixed solution. The grain size and framework SiO2/Al2O3 ratios decreased with reducing the alkalinity of synthetic system. The nano-NaY products with the grain size at a range of 82-105 nm and the framework SiO2/Al2O3 ratios at 3.9-4.0 could be synthesized by optimizing the synthesis conditions.