Is Nanostructuring Sufficient To Get Catalytically Active Au?

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• 作者：Alexander Yu. Klyushin ; Mark T. Greiner ; Xing Huang ; Thomas Lunkenbein ; Xuan Li ; Olaf Timpe ; Matthias Friedrich ; Michael Hävecker ; Axel Knop-Gericke ; Robert Schlögl
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：May 6, 2016
• 年：2016
• 卷：6
• 期：5
• 页码：3372-3380
• 全文大小：669K
• 年卷期：0
• ISSN：2155-5435

文摘

Gold nanoparticles on transition-metal oxides were synthesized by two different methods: precipitation and photoinduced decomposition of an intermediate gold–azido complex. Only samples prepared by the precipitation method showed significant CO conversion at low temperature. XPS shows the formation of two Au species (Au⁰ and Au^δ+) on the surface of active Au/TiO₂ and Au/Fe₂O₃ samples. The energy shift of the Au^δ+ peak depends on the support and is 0.6 and 0.9 eV for Au/TiO₂ and Au/Fe₂O₃, respectively. TEM images indicate the formation of overlayer on Au particles. These results prove Au activation via a strong metal–support interaction, on the basis of the strong influence of the support on the electronic structure of the gold through charge transfer and stabilization of low-coordinated Au atoms.