The heterogeneous interface in materials, due to its crucial role in catalytic reactions, has attracted much attention. Herein, we report the facile synthesis of Co3O4 and Ce/Ni-modified Co3O4 catalysts derived from ZIF-67 and their application in the aerobic oxidation of cyclohexane. The catalytic performance of the catalysts was greatly affected by the calcination temperature and molar ratio of the second metal (Ce, Ni) to Co. The catalytic performance of Co3O4 improved with the increase of the calcination temperature and reached a plateau at 400 °C due to the small-sized Co3O4 crystallites and developed pore structures. The introduction of the second metal improved the dispersion of Co3O4 and induced the creation of the oxygen vacancies at Co3O4-CeO2/NiO interface. The highest catalytic activity with 12.8% conversion and 95.5% selectivity were achieved over the Ce-Ni-modified Co3O4 catalyst with the molar ratio of Ce/Ni/Co=0.11/0.21/1.00. The superior catalytic performance of the Ce-Ni-modified catalyst can be ascribed to the highly dispersed Co3O4 crystallites and the activation of the oxygen molecules by the oxygen vacancies.

中文翻译：

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环己烷在金属有机骨架衍生的 Ce、Ni 修饰的 Co3O4 上的好氧氧化

材料中的异质界面因其在催化反应中的关键作用而备受关注。在此，我们报告了由 ZIF-67 衍生的 Co3O4 和 Ce/Ni 改性的 Co3O4 催化剂的简便合成及其在环己烷有氧氧化中的应用。催化剂的催化性能受煅烧温度和第二金属（Ce、Ni）与 Co 摩尔比的影响很大。 Co3O4 的催化性能随着煅烧温度的升高而提高，并在 400 °C 时达到平台小尺寸的 Co3O4 微晶和发达的孔隙结构。第二种金属的引入改善了 Co3O4 的分散，并诱导了 Co3O4-CeO2/NiO 界面处氧空位的产生。最高催化活性，转化率为 12.8% 和 95。在 Ce-Ni 改性的 Co3O4 催化剂上实现了 5% 的选择性，Ce/Ni/Co 的摩尔比为 0.11/0.21/1.00。Ce-Ni 改性催化剂的优异催化性能可归因于高度分散的 Co3O4 微晶和氧空位对氧分子的活化。