Preparation of Ti-containing mesoporous zeolite using two-step hydrothermal synthesis method

Novel mesostructured titanosilicates (Ti-MST) have been successfully assembled from preformed silicalite-1 precursors using two-step hydrothermal synthesis method. The samples were characterized by XRD, FT-IR, UV-vis and N2 physisorption. The results show that Ti-MST zeolites are pure mesoporous phase possessing zeolitic secondary building units (SBU) in the pore walls. UV-vis confirms the existence of tetrahedral coordinated titanium. N2 physisorption exhibits that the pore diameter and BET surface area of Ti-MST-8 are 2.8 nm and 1213 m2/g. Ti-MST displays high hydrothermal stability in boiling water as compared with Ti-MCM-41 due to the incorporation of SBU fragments in the mesopore walls.