期刊
JOURNAL OF CATALYSIS
卷 264, 期 2, 页码 175-182出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2009.04.001
关键词
Mesoporous silica; Titanium dioxide; Photocatalyst; Hydroxyl radical; Selective organic transformation; Phenol synthesis
资金
- Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT) [20360359]
- Grants-in-Aid for Scientific Research [20360359] Funding Source: KAKEN
Photocatalytic activity of TiO(2) particles embedded in mesoporous silica (TiO(2)@MPS), prepared by surfactant-templating method with a TiO(2) colloidal suspension, has been studied in water with molecular oxygen. Photocatalytic reactions of several kinds of aromatic molecules with TiO2@MPS reveal that less polar substrates show high reactivity, while polar substrates show much lower reactivity. Electron spin resonance analysis with spin-trapping reagents reveals that less polar substrates diffuse easily into the pore of the catalysts and react efficiently with short-lived hydroxyl ((center dot)OH) radicals formed at the surface of inner TiO(2) particles, resulting in a high reactivity. in contrast, polar substrates cannot diffuse into the pores and hence, shows a low reactivity. The photocatalytic activity of TiO(2)@MPS driven by the substrate polarity is applicable to selective transformation of a less polar reactant to a polar product. such as hydroxylation of benzene to phenol with high selectivity (>69%). (C) 2009 Elsevier Inc. All rights reserved.
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