Preparation of Ti incorporated Y zeolites by a post-synthesis method under acidic conditions and their catalytic properties

Ti incorporated Y zeolites were prepared by post-synthesis treatment of a dealuminated USY zeolite with an aqueous solution of (NH4)(2)TiF6, and characterized by XRD, Al-27 MAS NMR, FT-IR, SEM, TEM, UV-vis, and XANES techniques. The results showed that Ti species were tetrahedrally incorporated into the hydroxyl nests in the zeolite framework under acidic conditions. Furthermore, the catalytic performance of Ti incorporated Y zeolites in epoxidation of cycloalkenes using an aqueous solution of hydrogen peroxide was higher than that of TS-1 zeolite. (C) 2010 Elsevier B.V. All rights reserved.