【摘 要】
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Oxides supported gold has been shown to exhibit exceptional catalytic activity for CO oxidation at low temperatures,which has stimulated extensive experimen
【机 构】
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Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,P.R.China
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Oxides supported gold has been shown to exhibit exceptional catalytic activity for CO oxidation at low temperatures,which has stimulated extensive experimental and theoretical studies.However,the high activity of supported gold is still under debate.In this paper,we perform the reaction of CO with closed-shell gold-titanium heteronuclear oxide cluster anions in an effort to understand CO oxidation on Au/TiO2,which is a typical type of catalysts for efficient CO oxidation at low temperatures.The reactions are characterized by time-of-flight mass spectrometry and density functional theory calculations.Au(TiO2)yOz-clusters can efficiently oxidize CO into CO2.The computational studies identify the dual roles that gold atom plays in CO oxidation: functioning as CO trapper and electron acceptor.Both factors are important for the high reactivity of Au(TiO2)yOz-clusters.To the best of our knowledge,this is the first example of CO oxidation by gold-containing heteronuclear oxide clusters,which provides molecular-level insights into the roles of gold in CO oxidation over oxide supports.
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