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The Au/MnOx/TiO2 catalyst was used for the photocatalytic oxidation of carbon monoxide. The catalytic activity of Au/MnOx/TiO2 with low concentration of manganese (3–7 mol%) was much higher than that of Au/TiO2. The surface of Au/MnOx/TiO2 was characterized by XPS and Raman spectroscopy. While the main state of manganese in 13.8 mol% MnOx/TiO2 was Mn4+ species, Mn3+ was the dominant species...
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