| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
In this research program, we revealed that Particles of WO3 loaded with appropriate cocatalyst such as Pt can produce phenol from benzene with high selectivity in water containing molecular O2; the selectivity for phenol were much higher than those on conventional TiO2 photocatalysts that generated CO2 as a main product. The reactions using 18O-labeled O2 and H2O clearly and firstly revealed that the holes generated on Pt/WO3 react primarily with H2O molecules, even in the presence of benzene in aqueous solution, selectively generating OH radicals that subsequently react with benzene to produce phenol. In contrast, a portion of holes generated on TiO2 photocatalysts reacts directly with benzene molecules. This direct oxidation of substances by holes undoubtedly enhanced non-selective oxidation, consequently lowing selectivity for phenol by TiO2. The WO3 photocatalysts also exhibited high selectivity for partial oxidation of various alcohols to aldehydes or ketones in aqueous solution.
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