Ce₂O₃–CeO₂–CuO–MnO₂/CNTs catalysts were synthesized via a redox strategy, and presented 58–85% NO conversion at 80–180 °C. The 6% Ce₂O₃–CeO₂–CuO–MnO₂/CNTs catalyst displayed the optimal activity, which may be owing to the generation of amorphous mixed metal-oxide catalysts, and higher contents of Ce³⁺ and surface oxygen (O_y). The formation mechanism of the catalysts was proposed.