The one-step highly selective oxidation of cyclohexane into cyclohexanone and cyclohexanol as the essential intermediates of nylon-6 and nylon-66 is considerably challenging. Therefore, an efficient and low-cost catalyst must be urgently developed to improve the efficiency of this process. In this study, a Co₃O₄−CeO₂ composite oxide catalyst was successfully prepared through ultrasound-assisted co-precipitation. This catalyst exhibited a higher selectivity to KA-oil, which was benefited from the synergistic effects between Co₃₊/Co₂₊ and Ce₄₊/Ce₃₊ redox pairs, than bulk CeO₂ and/or Co₃O₄. Under the optimum reaction conditions, 89.6% selectivity to KA-oil with a cyclohexane conversion of 5.8% was achieved over Co₃O₄−CeO₂. Its catalytic performance remained unchanged after five runs. Using the synergistic effects between the redox pairs of different transition metals, this study provides a feasible strategy to design high-performance catalysts for the selective oxidation of alkanes.

将环己烷一步高选择性氧化成环己酮和环己醇作为尼龙 6 和尼龙 66 的基本中间体具有相当大的挑战性。因此，迫切需要开发一种高效、低成本的催化剂来提高该工艺的效率。本研究通过超声辅助共沉淀成功制备了Co ₃ O ₄ -CeO _{2复合氧化物催化剂。}该催化剂对 KA-油的选择性比块状 CeO ₂和/或 Co ₃ O _{4更高，这得益于 Co 3+} /Co ₂₊和 Ce ₄₊ /Ce _{3+氧化还原对之间的协同效应}. _{在最佳反应条件下，与Co 3} O ₄ -CeO ₂相比，KA-油的选择性为89.6%，环己烷转化率为5.8% 。其催化性能在五次运行后保持不变。利用不同过渡金属的氧化还原对之间的协同效应，本研究为设计用于烷烃选择性氧化的高性能催化剂提供了一种可行的策略。