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 ...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.展开更多
文摘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.
