过渡金属/氧化钴模型催化剂的制备及其表面吸附和反应的同步辐射研究

Under controlled conditions in ultrahigh vacuum systems, thin ordered cobalt oxide films will be prepared on the metal single crystal substrates. The electronic and geometric structures and mophologies of the cobalt oxide surfaces will be investigated in-situ by using synchrotron radiation photoemission spectroscopy and soft X-ray near-edge absorption fine structure, in combination with other surface science techniques such as low energy electron diffraction and scanning tunneling microscopy. Moreover, the adsorption and reaction of metal nanoparticles and probing molecules on the cobalt oxide surfaces will be studied. In detail, we will mainly address on the following issues: (1) the interaction bewteen metal nanoparticles and the cobalt oxide surfaces; (2) the growth, diffusion and agglomeration of metals on the mixed oxide surfaces; (3) the chemical states and electronic structures of adsorbed metal particles; (4) the above-mentioned processes and properties as a function of annealing temperatures; (5) the adsorption states and reaction mechanisms of the probing molecules on the surfaces of cobalt oxides and metals supported on cobalt oxide model catalysts. In combination with the theoretical calculations on the same systems, we attempt to gain deep insight into the intrinsic relationship between the surface structures of the cobalt oxides and their adsorption and catalytic properties.

利用超高真空可控原位样品制备技术，在金属单晶衬底上制备有序钴氧化物薄膜；运用同步辐射光电子能谱和近边 X 射线吸收精细结构等表征技术结合低能电子衍射和扫描隧道显微镜等技术，研究钴氧化物薄膜表面的电子结构、位相结构和表面形貌；研究纳米金属粒子和探针气体分子在此薄膜表面上的吸附和反应，考察金属与钴氧化物表面相互作用的本质、金属在钴氧化物表面上的生长、扩散或聚集过程和金属的化学态、电子结构以及它们随温度发生的变化等；研究探针气体分子在钴氧化物及金属/钴氧化物模型催化剂表面上化学吸附或反应的过程和机理等。结合理论计算，获得钴氧化物表面结构与其吸附和催化性能之间内在联系的信息。

利用超高真空可控原位样品制备技术，在金属单晶衬底上制备有序氧化物薄膜；运用同步辐射 光电子能谱和近边 X 射线吸收精细结构等表征技术结合低能电子衍射和扫描隧道显微镜等技术， 研究了氧化物薄膜表面的电子结构、位相结构和表面形貌；研究纳米金属粒子和探针气体分子在此薄 膜表面上的吸附和反应，考察金属与氧化物衬底表面相互作用的本质、金属在氧化物表面上的生长、 扩散或聚集过程和金属的化学态、电子结构以及它们随温度发生的变化等；研究探针气体分子在氧化物及金属/氧化物模型催化剂表面上化学吸附或反应的过程和机理等。