Transition metal oxides are attractive catalyst alternatives in liquid-phase oxidation reactions due to their lower cost and higher abundance compared with conventional noble metal catalysts. We investigated the catalytic properties of a systematic series of Co_3-xFe_xO₄ spinel catalysts synthesized by a hard-templating method, which were applied in the liquid-phase oxidation of styrene, benzyl alcohol and cinnamyl alcohol. O₂ and tert-butyl hydroperoxide (TBHP) were used as the oxidants in a comparative manner. For alcohol oxidation, TBHP leads to similar or slightly higher selectivity to the corresponding aldehydes compared with O₂. For the activation of C=C bonds, TBHP favors the oxidative cleavage pathway, while O₂ favors the epoxidation pathway. The comparison of the catalytic performance revealed that the activity of Co₃O₄ does not benefit from Fe doping using O₂ as the oxidant, while the substitution of Fe ≤ 10 % in the spinel structure is beneficial when TBHP is used. This is attributed to the different activation mechanisms of the oxidizing agents, being spin transfer in case of O₂ and partial decomposition in case of TBHP. Heterogeneity tests and reusability studies demonstrated the stability of the spinel catalysts.

过渡金属氧化物是液相氧化反应中有吸引力的催化剂替代品，因为与传统的贵金属催化剂相比，它们的成本较低且含量较高。我们研究了通过硬模板法合成的系统系列的Co _3-x Fe _x O ₄尖晶石催化剂的催化性能，该催化剂被用于苯乙烯，苯甲醇和肉桂醇的液相氧化。以比较的方式使用O ₂和氢过氧化叔丁基（TBHP）作为氧化剂。对于醇氧化，TBHP与O ₂相比对相应的醛具有相似或略高的选择性。对于C = C键的活化，TBHP有利于氧化裂解途径，而O ₂有利于环氧化途径。催化性能的比较表明，使用O ₂作为氧化剂，Fe掺杂不会使Co ₃ O ₄的活性受益，而当使用TBHP时，尖晶石结构中Fe≤10％的取代是有益的。这归因于氧化剂的不同活化机制，在O _2的情况下是自旋转移，在TBHP的情况下是部分分解。异质性测试和可重复使用性研究证明了尖晶石催化剂的稳定性。