Preparation of hydrophobically modified single-site Ti-containing mesoporous silica (TiSBA-15) and their enhanced catalytic performances

Hydrophobic modification of single-site Ti-oxide moieties containing mesoporous silica (TiSBA-15) surfaces was performed by using triethoxyfluorosilane (TEFS) as a silylation reagent. The pore structure as well as the high surface area of TiSBA-15 was retained even after modification of these surfaces. TiSBA-15 modified with suitable amount of TEFS exhibited higher catalytic performance for the selective oxidation of cyclooctene to 1,2-epoxy cyclooctane using aqueous H2O2 as an oxidant than the unmodified TiSBA-15. The improvement of surface hydrophilic-hydrophobic properties of TiSBA-15 is quite effective for the enhancement of catalytic activity. (C) 2011 Elsevier B.V. All rights reserved.