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The interaction of CO and O 2 with Au/TiO 2 and Au/Al 2 O 3 catalysts is studied with EPR spectroscopy. Adsorption of CO and O 2 can produce at room temperature in both fresh catalysts O 2− radicals stabilized on support cations (suggesting a spillover process exists at least in Au/Al 2 O 3 ); thus, O 2− generation does...
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