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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Photoemission spectroscopy study of Cu/CeO2 systems: Cu/CeO2 nanosized catalyst and CeO2(111)/CU(111) inverse model catalyst
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Photoemission spectroscopy study of Cu/CeO2 systems: Cu/CeO2 nanosized catalyst and CeO2(111)/CU(111) inverse model catalyst

机译:Cu / CeO2体系的光发射光谱研究:Cu / CeO2纳米催化剂和CeO2(111)/ CU(111)反模型催化剂

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摘要

Cerium oxide films equivalent to 2 ML Of CeO2 were grown at 520 K in an oxygen atmosphere on a clean Cu(111) substrate in order to prepare a model catalytic system. This "inverse model catalyst" was characterized by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) of core levels, and resonant photoelectron spectroscopy (RPES) of the valence band. Samples annealed at 770 K exhibited a LEED pattern corresponding to the (1.5 x 1.5) CeO2(111)/CU(111) structure that can be interpreted as formation of a flat, well-ordered cerium oxide overlayer aligned with the principal crystallographic axes of the substrate. The model catalytic system corresponds well to a copper-loaded ceria nanopowder catalyst that exhibits growth of Cu(111) film structure on CeO2(111) planes. Lowering of the CO oxidation temperature due to the Cu loading is explained by CO adsorption on copper in the vicinity of highly active ceria planes providing oxygen for the reaction.
机译:在氧气气氛中,在干净的Cu(111)衬底上,在520 K的条件下,生长了相当于2 ML CeO2的氧化铈薄膜,以制备模型催化体系。该“逆模型催化剂”的特征在于低能电子衍射(LEED),核心能级的X射线光电子能谱(XPS)和价带的共振光电子能谱(RPES)。在770 K退火的样品表现出与(1.5 x 1.5)CeO2(111)/ CU(111)结构相对应的LEED模式,可以解释为形成与主晶轴对齐的平坦,有序的氧化铈覆盖层基板。模型催化系统很好地对应于负载铜的二氧化铈纳米粉末催化剂,该催化剂在CeO2(111)平面上显示Cu(111)薄膜结构的生长。由于铜负载而导致的CO氧化温度的降低是由于CO在高活性二氧化铈平面附近吸附在铜上,从而为反应提供了氧气。

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