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

Catalysts

Sridhar Budhi²  Chia-Ming Wu³  Dan Zhao¹  Ranjit T. Koodali³ 

[1] Department of Chemical Engineering, Ningbo University of Technology, Ningbo 315016, China; E-Mail:;Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401, USA; E-Mail:;Department of Chemistry, University of South Dakota, 414 E. Clark Street, Vermillion, SD 57069, USA; E-Mail:

关键词: titanium dioxide;    MCM-48;    cubic mesoporous materials;    cyclohexene;    epoxidation;   

DOI  :  10.3390/catal5031603

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
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