Investigation of Room Temperature Synthesis of Titanium Dioxide Nanoclusters Dispersed on Cubic MCM-48 Mesoporous Materials

Abstract

Titania containing cubic MCM-48 mesoporous materials were synthesized successfully at room temperature by a modified Stöber method. The integrity of the cubic mesoporous phase was retained even at relatively high loadings of titania. The TiO2-MCM-48 materials were extensively characterized by a variety of physico-chemical techniques. The physico-chemical characterization indicate that Ti 4+ ions can be substituted in framework tetrahedral positions. The relative amount of Ti 4+ ions in tetrahedral position was dependent on the order of addition of the precursor. Even at relatively high loadings of titania, no distinct bulk phase of titania could be observed indicating that the titania nanoclusters are well dispersed on the high surface area mesoporous material and probably exist as amorphous nanoclusters. The TiO2-MCM-48 materials were found to exhibit 100% selectivity in the cyclohexene oxidation at room temperature in the presence of tert-butylhydroperoxide (t-BHP) as the oxidant. The results suggest that room temperature synthesis is an attractive option for the preparation of TiO2-MCM-48 materials with interesting catalytic properties. OPEN ACCESSCatalysts 2015, 5 1604

Facile Synthesis of Ag‐TiO2 Hybrid Nanocluster:A Comprehensive Experimental and Computational Insight into the Role of Surface Ligands on Enhanced Visible Light Photo‐catalysis

“…A small broad peak centered at 2θ of 42 and 60 could be attributed to the presence of silver nanocluster. Broadened diffraction peaks also suggest the ultra‐small size (< 3 nm) of constituents and well dispersed nature of the hybrid nanocluster . It also indicates the amorphous like or crystalline with small crystalline size (<3 nm).…”

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