Amorphous titania was added to the gel for titanium silicalite synthesis using TPABr as templating agent. In the hydrothermal condition, a nanostructured titanium silicalite grew on the amorphous titania owing to the restriction effect of titania. The resulting material had low XRD crystallinity (below 40%) but high IR crystallinity ( I 550 / I 450 >0 7). High resolution TEM showed that the material contained particles with dimension less than 50 nm. A typical catalyst with n (Si)/ n (Ti)=2 contained secondary porous structure with diameter of about 8 nm, which was disclosed by N 2 desorption data. The catalytic activity of TS/TiO 2 catalyst was even higher than TS 1 catalyst in epoxidation of 3 chloropropylene with aqueous hydrogen peroxide. A new cheap method to prepare the highly active catalyst for selective oxidation was provided.
