Abstract Elucidation of the CuOx-CeO2 interactions is of great interest and importance in understanding complex CuOx-CeO2 interfacial catalysis in various reactions. In the present work, we have investigated structures and catalytic activity in CO oxidation of CuOx species on CeO2 rods, cubes and polyhedra predominantly exposing {110}+{100}, {100} and {111} facets by the incipient wetness impregnation method with the lowest Cu loading of 0.025%. The structural evolution of CuOx species was found to depend on both the Cu loading and the CeO2 morphology. As the Cu loading increases, CuOx species are deposited preferentially on the surface defect of CeO2 and then aggregate and grow, accompanied by the formation of isolated Cu ions, CuOx clusters strongly/weakly interacting with the CeO2, highly dispersed CuO nanoparticles, and large CuO nanoparticles. The isolated Cu+ species and CuOx clusters weakly interacting with the CeO2 were observed mainly on the O-terminated CeO2{100} facets. Meanwhile, more Cu(I) species are stabilized during CO reduction processes in CuOx/c-CeO2 catalysts than in CuOx/r-CeO2 and CuOx/p-CeO2 catalysts. The catalytic activities of various CuOx/CeO2 catalysts in CO oxidation vary with both the CuOx species and the CeO2 morphology. These results comprehensively elucidate the CuOx-CeO2 interactions and exemplify their morphology-dependence.

中文翻译：

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从一开始就了解形态相关的 CuO -CeO2 相互作用

摘要 阐明CuOx-CeO2 相互作用对于理解各种反应中复杂的CuOx-CeO2 界面催化具有重要意义和重要性。在目前的工作中，我们研究了在 CeO2 棒、立方体和多面体上通过初湿浸渍法主要暴露 {110}+{100}、{100} 和 {111} 面的 CuOx 物质的 CO 氧化的结构和催化活性最低的铜负载量为 0.025%。发现 CuOx 物种的结构演变取决于 Cu 负载和 CeO2 形态。随着Cu负载量的增加，CuOx物种优先沉积在CeO2的表面缺陷上，然后聚集和生长，同时形成孤立的Cu离子、与CeO2强/弱相互作用的CuOx簇、高度分散的CuO纳米颗粒和大的CuO纳米粒子。主要在 O 封端的 CeO2{100} 面上观察到孤立的 Cu+ 物质和 CuOx 簇与 CeO2 弱相互作用。同时，与 CuOx/r-CeO2 和 CuOx/p-CeO2 催化剂相比，CuOx/c-CeO2 催化剂在 CO 还原过程中稳定了更多的 Cu(I) 物种。各种 CuOx/CeO2 催化剂在 CO 氧化中的催化活性随 CuOx 物种和 CeO2 形态的不同而变化。这些结果全面阐明了 CuOx-CeO2 相互作用并举例说明了它们的形态依赖性。各种 CuOx/CeO2 催化剂在 CO 氧化中的催化活性随 CuOx 物种和 CeO2 形态的不同而变化。这些结果全面阐明了 CuOx-CeO2 相互作用并举例说明了它们的形态依赖性。各种 CuOx/CeO2 催化剂在 CO 氧化中的催化活性随 CuOx 物种和 CeO2 形态的不同而变化。这些结果全面阐明了 CuOx-CeO2 相互作用并举例说明了它们的形态依赖性。