推动绿氨燃料上船应用已被普遍认为是实现全球航运业绿色低碳转型可行途径。然而，船用氨燃料发动机存在的N₂O排放问题已成为阻碍氨动力船舶发展的关键技术瓶颈之一。针对这一问题，采用浸渍法制备出一系列以TiO₂为载体的过渡金属氧化物催化剂，考察了过渡金属元素类型对催化剂N₂O去除性能的影响，并研究获得了性能优化的Cu_x/TiO₂催化剂。结果表明，与Fe₅/TiO₂、Mn₅/TiO₂、Co₅/TiO₂、Ni₅/TiO₂催化剂相比，Cu₅/TiO₂催化剂显示出优异的催化活性，其N₂O转化率可在350 ℃达到100%。除此之外，Cu₅/TiO₂催化剂还具有良好的抗水性能。5%是最佳的铜负载量。采用X射线衍射、N₂吸附脱附、H₂程序升温还原、O₂程序升温脱附、原位漫反射傅里叶变换红外光谱等表征手段对性能较优的Cu₅/TiO₂催化剂的物化性质和表面反应中间体进行了表征，从多角度深入讨论了相关催化反应机理。结果显示，与其他Cu_x/TiO₂催化剂相比，Cu₅/TiO₂催化剂具有较高的活性物种分散度、比表面积、氧空位含量以及较强的氧化还原性能，有利于其展现出较优的催化活性。Cu₅/TiO₂催化剂表面的主要活性物种为Cu²⁺和Cu⁺，N₂O的吸附和解离是催化反应的关键步骤。

The application of green NH₃-fuel on board has been widely regarded as a feasible way to realize the green and low-carbon transformation of the global shipping industry. However, the N₂ O emission problem of marine NH₃-fuel engines has become one of the key technical bottlenecks hindering the development of ammonia-powered ships. To solve this problem, a series of TiO₂-supported transition metal oxide catalysts were prepared by impregnation method. The effect of transition metal element types on the N₂O removal performance of the catalysts was investigated, and the N₂O removal performance of Cu_x/TiO₂ catalysts was optimized. The results show that compared with Fe₅/TiO₂, Mn₅/TiO₂, Co₅/TiO₂ and Ni₅/TiO₂ catalysts, Cu₅/TiO₂ catalyst shows excellent catalytic activity, the N₂O conversion efficiency can reach 100% at 350 ℃. In addition, Cu₅/TiO₂ catalyst also has good water resistance. The experimental results show that 5% is the best Cu loading amount. X-ray diffraction, N₂ adsorption-desorption, H₂ temperature programmed reduction, O₂ temperature programmed desorption, and in-situ diffuse reflectance infrared Fourier transform spectroscopy were used to characterize the physicochemical properties and surface reaction intermediates of Cu₅/TiO₂ catalyst, and the relevant catalytic reaction mechanisms were discussed in depth from multiple perspectives. The characterization results show that compared with other Cu_x/TiO₂ catalysts, Cu₅/TiO₂ catalyst has higher dispersion of active species, specific surface area, oxygen vacancy content and stronger redox performance, which is conducive to its better catalytic activity. The main active species on the surface of Cu₅/TiO₂ catalyst are Cu²⁺and Cu⁺ species, and the adsorption and deionization of N₂O is a key step in the catalytic reaction.