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Open AccessArticle

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

1
Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401, USA
2
Department of Chemistry, University of South Dakota, 414 E. Clark Street, Vermillion, SD 57069, USA
3
Department of Chemical Engineering, Ningbo University of Technology, Ningbo 315016, China
*
Author to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Catalysts 2015, 5(3), 1603-1621; https://doi.org/10.3390/catal5031603
Received: 2 August 2015 / Revised: 1 September 2015 / Accepted: 11 September 2015 / Published: 18 September 2015
(This article belongs to the Special Issue Feature Papers to Celebrate the Landmarks of Catalysts)
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 Ti4+ ions can be substituted in framework tetrahedral positions. The relative amount of Ti4+ 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. View Full-Text
Keywords: titanium dioxide; MCM-48; cubic mesoporous materials; cyclohexene; epoxidation titanium dioxide; MCM-48; cubic mesoporous materials; cyclohexene; epoxidation
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Budhi, S.; Wu, C.-M.; Zhao, D.; Koodali, R.T. Investigation of Room Temperature Synthesis of Titanium Dioxide Nanoclusters Dispersed on Cubic MCM-48 Mesoporous Materials. Catalysts 2015, 5, 1603-1621.

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