Preparation of titanium-containing zeolites with MEL structure from B-ZSM-11 and their characterization Original Research Article

Titanium-containing MEL zeolites (Ti-ZSM-11) are prepared by gas–solid reactions between TiCl4 vapor and B-ZSM-11 precursors. XRD, FTIR, UV–Vis, 11B and 29Si MAS NMR techniques are used to characterize these materials. The results show that Ti atoms are incorporated into the silanol nests that were previously occupied by B atoms. The precursor deboronated by acid reflux possesses a large amount silanol nests and so can obtain a high concentration of titanium in the framework, compared to the directly calcinated precursors. Ti-ZSM-11 zeolites are used to catalyze the epoxidation of propylene with dilute hydrogen peroxide. The results show that the catalytic activities are related to the physicochemical properties of these materials.