Ni (Co) doped CeO₂ were prepared via hydrothermal, sol-gel and solid state methods for NO + CO reaction (CO + NO → CO₂ + N₂). The catalysts prepared by hydrothermal method (denoted as NiCe-HT and CoCe-HT) exhibited higher NO elimination efficiency than that by the other two methods due to their novel nanosheets-assembled microsphere structures and higher specific surface areas. Further characterization revealed that the better catalytic performance of NiCe-HT than CoCe-HT benefits from the easier reduction behavior, more oxygen vacancies and abundant surface chemical oxygen, leading to the NO complete elimination temperature of 175 ^ºC and lifetime more than 40 h. In situ DRIFTS experiments indicated that the addition of Ni and Co into CeO₂ can enhance NO and CO adsorption capacity, unstable intermediates were easier to be generated and converted on NiCe-HT than CoCe-HT. Finally, a possible mechanism for NO + CO reaction was proposed to understand the reaction processes.

通过水热法，溶胶-凝胶法和固态法制备用于Ni + Co反应（CO + NO→CO ₂ + N ₂）的Ni（Co）掺杂CeO ₂。通过水热法制备的催化剂（称为NiCe-HT和CoCe-HT）比其他两种方法表现出更高的NO去除效率，这是由于它们具有新颖的纳米片组装微球结构和更高的比表面积。进一步的表征表明，与CoCe-HT相比，NiCe-HT的催化性能更好，这归因于其更易还原的行为，更多的氧空位和丰富的表面化学氧，从而使NO的完全消除温度达到^175ºC，寿命超过40 h。原位DRIFTS实验表明，在CeO _2中添加Ni和Co可以增强NO和CO的吸附能力，不稳定的中间体在NiCe-HT上比CoCe-HT更易于生成和转化。最后，提出了一种可能的NO + CO反应机理来理解反应过程。