MCo₂O₄ (M = Co, Cu, Ni or Zn) spinel catalysts have been prepared using a chemical co-precipitation method and applied in toluene combustion. The physicochemical properties of the MCo₂O₄ catalysts was discussed to explore the impact of substitution on the tetrahedral A-site ions. The results of the activity evaluation show that the catalytic performances of Co₃O₄, CuCo₂O₄ and NiCo₂O₄ with urchin-like morphology are far superior than ZnCo₂O₄ nanoparticles. The CuCo₂O₄ catalyst exhibited the most superior performance for toluene combustion, and the toluene conversion rate reached 90% at 230 °C. When compared to the other catalysts, the optimal activity of CuCo₂O₄ was attributed to the presence of more reactive oxygen species, a higher concentration of Co³⁺ ions on catalyst surface and better reducibility at relative lower temperature. Moreover, the catalytic activity of the CuCo₂O₄ catalyst did not decrease significantly in the long-term test, demonstrating its excellent stability.

MCo ₂ O ₄ (M = Co、Cu、Ni或Zn)尖晶石催化剂采用化学共沉淀法制备并应用于甲苯燃烧。讨论了MCo ₂ O ₄催化剂的物理化学性质，以探索取代对四面体A位离子的影响。活性评价结果表明，具有海胆状形态的Co ₃ O ₄、CuCo ₂ O ₄和NiCo ₂ O ₄的催化性能远优于ZnCo ₂ O ₄纳米粒子。CuCo ₂ O ₄催化剂对甲苯燃烧表现出最 优越的性能，在 230 ℃时甲苯转化率达到 90%。与其他催化剂相比，CuCo ₂ O ₄的最佳活性归因于存在更多的活性氧物质、催化剂表面上更高浓度的 Co ³⁺离子以及在相对较低的温度下更好的还原性。此外，CuCo ₂ O ₄催化剂的催化活性在长期试验中没有明显降低，证明了其优异的稳定性。