Synthesis of ZSM-23 Zeolite Using Isopropylamine as Template

The synthesis of ZSM-23 in the hydrothermal system of isopropylamine-silica sol-NaAlO2-H2O was investigated. Pure ZSM-23 with high crystallinity was synthesized when the SiO2/Al2O3 molar ratio in the gel was between 60 and 150. The SiO2/Al2O3 molar ratio, template concentration, gel alkalinity, and water content were critical in the crystal phase transition. The template concentration and SiO2/Al2O3 molar ratio played important roles in the morphology control of the products. ZSM-23 zeolites with different morphologies were obtained under different experimental conditions.