Co₃O₄–CeO₂ composite oxides with various ratios of Ce/Co were fabricated by the hydrothermal method, and their activities in N₂O decomposition have been studied. Co₃O₄–CeO₂ catalyst is more active than pristine Co₃O₄ and CeO₂ catalysts. Over Co₃O₄–CeO₂ catalyst the strong interaction between Co₃O₄ and CeO₂ existed, which suppressed the crystallization of Co₃O₄, resulting in the large surface area. Particularly, the synergetic effect between Co₃O₄ and CeO₂ induces the formation of more active Co³⁺ and enhanced redox property of Co₃O₄–CeO₂ catalyst. The desorption of adsorbed oxygen, which is the key step in N₂O decomposition, can be promoted due to the existed redox cycle (Co²⁺ + Ce⁴⁺ ↔ Co³⁺ + Ce³⁺). Therefore, Co₃O₄–CeO₂ composite oxide showed high activity for N₂O decomposition.

采用水热法制备了不同比例的Ce / Co的Co ₃ O ₄ -CeO ₂复合氧化物，并研究了其在N ₂ O分解中的活性。Co ₃ O ₄ -CeO ₂催化剂比原始的Co ₃ O ₄和CeO ₂催化剂更具活性。在Co ₃ O ₄ -CeO ₂催化剂上，Co ₃ O ₄与CeO _2之间存在强相互作用，从而抑制了Co ₃ O ₄的结晶。，导致表面积很大。特别是，Co ₃ O ₄和CeO ₂之间的协同作用诱导了活性更高的Co ³⁺的形成，并增强了Co ₃ O ₄ -CeO ₂催化剂的氧化还原性能。由于存在氧化还原循环（Co ²⁺ + Ce ⁴⁺ ↔Co ³⁺ + Ce ³⁺），可以促进作为N ₂ O分解关键步骤的吸附氧的解吸。因此，Co ₃ O ₄ -CeO ₂复合氧化物对N ₂ O分解具有很高的活性。