Fine Chemical Synthesis on Metal Nanoparticle Photocatalysts

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Efficient and selective photocatalytic reactions have been achieved with the photocatalysts loaded with metal nanoparticles. We clarified that several reactions such as secondary amine synthesis from alcohol and nitroaromatics, dehalogenation of aromatic halides, and hydrogen peroxide production by the catalysts loaded with Pd, Pt-Pd alloy, and Au-Ag alloy nanoparticles. In particular, we found that Au or Pt nanoparticles when loaded on titanium dioxide promotes efficient aerobic oxidation via the absorption of visible light by the particles followed by the transfer of excited electrons to semiconductor conduction band. In addition, supported Au-Cu alloy particles efficiently promote aerobic oxidation, although the activity decreases with by the oxidation of surface Cu atoms. We found that visible light irradiation successfully reduces the oxidized surface Cu via the visible light absorption by Au atoms, thus maintaining high oxidation activity.