Reduction for oxidation: After preliminary treatment with molecular hydrogen, Au/TiO2 and Au/Al2O3 catalysts were able to induce O2 isotope exchange at mild conditions (−15 °C), which is believed to proceed through highly reactive surface oxygen species. However, the relative intensity of such an exchange is markedly different (see picture) and is in accordance with the diverse profiles of ethanol oxidation over gold nanoparticles supported on TiO2, Al2O3, and SiO2 matrixes.
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