A series of Co_xCe_1-xO_2-δ (x = 0.05−0.6) oxides were synthesized through non-ionic surfactant hydrothermal method and applied for catalytic toluene oxidation. Various characterizations were performed to investigate the relation between structure and activity of the catalysts, including XRD, N₂ adsorption-desorption, Raman spectra, TEM, H₂-TPR, O₂-TPD, XPS and in situ DRIFTS. Co_xCe_1-xO_2-δ shows higher catalytic performance than pure Co₃O₄ and CeO₂, meanwhile Co_0.2Ce_0.8O_2-δ exhibits the best catalytic activity for toluene oxidation in the presence and absence of water, moreover, no obvious difference in activity among three successive testing runs. This good activity can be mainly attributed to the strong interaction between Co and Ce oxides to form Co_0.2Ce_0.8O_2-δ solid solution, leading to abundant surface active oxygen species, more surface Co³⁺ and Ce³⁺ species. In situ DRIFTS is used to probe the catalytic reaction process, which reveals that toluene can be rapidly adsorbed and transferred to benzoate species, finally oxidized into CO₂ and H₂O.

通过非离子表面活性剂水热法合成了一系列Co _x Ce _1-x O2 _-δ（x = 0.05-0.6）氧化物，并用于催化甲苯氧化。进行了各种表征以研究催化剂的结构与活性之间的关系，包括XRD，N ₂吸附-解吸，拉曼光谱，TEM，H ₂ -TPR，O ₂ -TPD，XPS和原位DRIFTS。Co _x Ce _1-x O2 _-δ表现出比纯Co ₃ O ₄和CeO ₂更高的催化性能，而Co _0.2 Ce _0.8 O在有水和无水的情况下，_2-δ表现出对甲苯氧化的最佳催化活性，而且在三个连续的测试运行中，活性没有明显差异。这种良好的活性主要归因于Co和Ce氧化物之间的强相互作用，形成了Co _0.2 Ce _0.8 O2 _-δ固溶体，从而导致了丰富的表面活性氧种类，更多的表面Co ³⁺和Ce ³⁺种类。原位DRIFTS被用于探测催化反应过程中，这表明，甲苯可以迅速地吸附并转移至苯甲酸物种，最后氧化成CO ₂和H ₂ O.