为协助工业界实现碳达峰与碳中和的目标,聚焦于低温烟气中氮氧化物（NO_x）和一氧化碳（CO）的协同脱除,以铈（Ce）和锰（Mn）的无机盐为前驱体,采用共沉淀法、机械球磨法、溶液燃烧法和溶胶-凝胶法制备了Ce元素改性的Mn基氨选择性催化还原（NH₃-SCR）/一氧化碳（CO）氧化双效纳米催化剂。使用固定床-在线质谱/色谱测试系统对催化剂性能进行了评价,并利用X射线衍射、氮气-物理吸附等表征手段对Ce-MnO_x纳米催化剂进行了表征分析。结果表明,反向共沉淀法制备的催化剂具有最优的NO_x和CO协同脱除性能,在100 000 mL/（g·h）的高空速条件下,140 ℃以上能够实现CO净化率超过85%,100 ℃以上能够脱除气体中80%以上的NO_x,且运行20 h后仅出现微弱的性能衰减。其活性组分为具有高比表面积（100 m²/g以上）的CeMnO_x,因此能够吸附更多气体进行反应,表现出优异的催化性能。

In order to assist the industry in achieving the goal of emission peak and carbon neutrality,focusing on the syner-gistic removal of oxynitrides（NO_x） and carbon monoxide（CO） in low-temperature flue gas,inorganic salts of cerium（Ce） and manganese（Mn） were used as precursors,then Mn-based ammonia selective catalytic reduction（NH₃-SCR）/CO oxidation bi-functional nanocatalysts modified by Ce were prepared by co-precipitation,mechanical ball milling,solution combustion and sol-gel methods.The catalytic performance was evaluated on a fixed bed reactor with online mass spectrometry/chromato-graphy system.The structure of Ce-MnO_x nanocatalysts were characterized and analyzed by X-ray diffraction,N₂-physisorp-tion and other techniques.The results showed that the catalyst prepared by the reverse co-precipitation method had the best performance for synergistic removal of NO_x and CO.At a high space velocity of 100 000 mL/（g·h）,more than 85% of CO purification can be achieved above 140 ℃,more than 80% of NO_x in the gas can be removed above 100 ℃,and only a slight performance degradation occurs after 20 h of operation.The active component was CeMnO_x with a high specific surface area above 100 m²/g,which could adsorb more gas for reaction and showed excellent catalytic performance.