Abstract: The synthesis of UZM-5 zeolite by the hydrothermal method in the tetraethylammonium hydroxide (TEAOH)-tetramethylammonium chloride (TMACl) two-organic component system was studied. The products were characterized using X-ray diffraction, infrared spec-troscopy, and thermogravimetry. The crystallization process and growth of UZM-5 zeolite were investigated. The results indicated that the UZM-5 zeolite could be synthesized when the initial mixture was SiO2:(0.16–0.5)Al2O3:(0.4–1.0)TEAOH:(0.06–0.13)TMACl:20H2O. Too high temperature was disadvantageous to the crystallization process. UZM-5 zeolite could be synthesized in the temperature range of 403–423 K. Too long time led to the crystallization of sodalite zeolite. The synthesis of UZM-5 zeolite with silica sol needs 2 days, while silicic acid 4 days and silica gel 5 days. A small amount of Na+ ions resulted in the crystallization of UZM-9 zeolite and had an effect on the phase selectivity.

Key words: UZM-5 zeolite, UZM-9 zeolite, tetraethylammonium hydroxide, tetramethylammonium chloride, hydrothermal method, silica source, sodium ion