Is Nanostructuring Sufficient To Get Catalytically Active Au?
Is Nanostructuring Sufficient To Get Catalytically Active Au?
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DOI：
10.1021/acscatal.5b02631
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发表时间：
2016-05-01
期刊：
影响因子：
12.9
通讯作者：
Schloegl, Robert
中科院分区：
文献类型：
--
作者：
Klyushin, Alexander Yu.;Greiner, Mark T.;Schloegl, Robert
采用沉淀法和叠氮络合物光诱导分解法制备了过渡金属氧化物负载的金纳米粒子。只有通过沉淀法制备的样品在低温下显示出显著的CO转化率。XPS分析表明，活性Au/TiO 2和Au/Fe 2 O 3样品表面形成了两种Au物种（Au-0和Au delta+）。Au δ +峰的能量位移取决于载体，对于Au/TiO 2和Au/Fe 2 O 3，分别为0.6和0.9 eV。TEM图像表明在Au颗粒上形成了覆盖层。这些结果证明了Au通过强金属-载体相互作用的活化，基于载体通过电荷转移和低配位Au原子的稳定化对金的电子结构的强烈影响。
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 (Au-0 and Au delta+) on the surface of active Au/TiO2 and Au/Fe2O3 samples. The energy shift of the Au delta+ 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.