摘要
磅的一致的簇在 capping-agent-free CeO2 nanooctahedra 和 nanorods 使用电子横梁(电子横梁) 的表面上被扔了蒸发。磅 nanocluster 层的范围能被调整电子横梁蒸发时间控制。产生电子横梁在 CeO2 表面上蒸发了磅 nanocluster 层有在磅和 CeO2 之间的干净表面和干净接口。CeO2 nanocrystals 的二种类型上的磅的不同生长行为被观察，与 CeO2 nanooctahedra 上的磅的取向附生的生长和 CeO2 nanorods 上的磅的随机的生长。CeO2 nanocrystals 的二种不同类型上的磅簇的结构被为模型反应把他们用作催化剂学习了并且比较。加氢反应的结果清楚地在两催化剂显示出磅簇的干净、类似的化学表面。这些催化剂的支持依赖者活动被公司氧化表明。因为氧空缺的更高的集中， Pt/CeO2 nanorods 在 CeO2 nanorods 与 Pt/CeO2 nanooctahedra 相比显示出许多更高的活动。除氢作用反应的结构依赖者选择显示 CeO2 nanorods 和 nanooctahedra 上的磅的结构是不同的。因为金属免职行为被强壮的金属金属氧化物相互作用调制， Thes 差别产生。
Uniform clusters of Pt have been deposited on the surface of capping-agent-free CeO2 nanooctahedra and nanorods using electron beam （e-beam） evaporation. The coverage of the Pt nanocluster layer can be controlled by adjusting the e-beam evaporation time. The resulting e-beam evaporated Pt nanocluster layers on the CeO2 surfaces have a clean surface and clean interface between Pt and CeO2. Different growth behaviors of Pt on the two types of CeO2 nanocrystals were observed, with epitaxial growth of Pt on CeO2 nanooctahedra and random growth of Pt on CeO2 nanorods. The structures of the Pt clusters on the two different types of CeO2 nanocrystals have been studied and compared by using them as catalysts for model reactions. The results of hydrogenation reactions clearly showed the clean and similar chemical surface of the Pt clusters in both catalysts. The support- dependent activity of these catalysts was demonstrated by CO oxidation. The Pt/CeO2 nanorods showed much higher activity compared with Pt/CeO2 nanooctahedra because of the higher concentration of oxygen vacancies in the CeO2 nanorods. The structure-dependent selectivity of dehydrogenation reactions indicates that the structures of the Pt on CeO2 nanorods and nanooctahedra are different. Thes differences arise because the metal deposition behaviors are modulated by the strong metal-metal oxide interactions.
