Journal of the Chemical Society - Faraday Transactions p. 1261 - 1266 (1995)
Update date:2022-08-24
Topics:
Imamura, Selichiro
Nakai, Tohru
Kanai, Hiroyoshi
Ito, Tomoyasu
The states of Ti in titania-silica mixed oxides have been studied by varying the Ti content.EXAFS analyses indicated that the amount of tetrahedral Ti species increased with a decrease in the Ti content reaching a maximum at 10 to 20 molpercent of Ti while octahedrally coordinated Ti predominated in the high Ti content region (Ti >/= 50 molpercent).Tetrahedral Ti species catalyse the epoxidation of oct-1-ene and cyclohexene using tert-butyl hydroperoxide as an oxidant.Lewis acid sites of the titania-silica also originated from the tetrahedral Ti species.Both epoxidation activity and Lewis acidity of the titania-silica were well explained by the coordinative unsaturation of the tetrahedral Ti site.
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