The active components Mn and Fe oxides were loaded on the surface of CeO₂ catalyst with nanopolyhedrons morphology (CeO₂-NPs) by impregnation method to improve the CeO₂-NPs catalyst catalytic performance. The activity test results showed that the activity order of these catalysts within the temperature of 100–300 °C was Fe-Mn-Ce > Mn-Ce > Ce catalyst, and the NO conversion rate of Fe-Mn-Ce catalyst was the highest at 200 °C, which was about 98%. The performances of these catalysts were further investigated by SEM, XRD, XPS, Raman spectra, H₂-TPR, NH₃-TPD and in situ DRIFT. The results indicated that Fe-Mn-Ce catalyst possessed the best reducibility and surface acidity of the three catalysts. According to the XPS and Raman spectra tests, the sequences of the ratio of O_α/(O_α+O_β) and Ce³⁺/(Ce³⁺+Ce⁴⁺) were both Fe-Mn-Ce > Mn-Ce > Ce catalyst, which indicated that the Fe-Mn-Ce catalyst possessed the most oxygen vacancy and further improved the catalytic activity of the catalyst. Moreover, the Fe-Mn-Ce catalyst also exhibited the best tolerance to SO₂ of the three catalysts at 225 °C. In general, simultaneous loading of manganese and iron oxides on the CeO₂-NPs catalyst could effectively improve the low temperature SCR performance of the catalyst.

通过浸渍法将活性组分Mn和Fe氧化物负载在具有纳米多面体形态(CeO ₂ -NPs)的CeO ₂催化剂表面，以提高CeO ₂ -NPs催化剂的催化性能。活性测试结果表明，这些催化剂在100-300℃温度范围内的活性顺序为Fe-Mn-Ce>Mn-Ce>Ce催化剂，其中Fe-Mn-Ce催化剂的NO转化率最高。在 200 °C 时，约为 98%。通过SEM、XRD、XPS、拉曼光谱、H ₂ -TPR、NH ₃ -TPD和原位对这些催化剂的性能进行了进一步研究。漂移。结果表明，Fe-Mn-Ce催化剂具有三种催化剂中最好的还原性和表面酸性。根据 XPS 和拉曼光谱测试，O _α /(O _α +O _β ) 和 Ce ³⁺ /(Ce ³⁺ +Ce ⁴⁺ )比的顺序为Fe-Mn-Ce > Mn-Ce > Ce催化剂，表明Fe-Mn-Ce催化剂具有最多的氧空位，进一步提高了催化剂的催化活性。此外，Fe-Mn-Ce催化剂在 225 °C 时也表现出三种催化剂中对 SO ₂的最佳耐受性。通常，同时在 CeO ₂上负载锰和铁的氧化物-NPs催化剂可以有效提高催化剂的低温SCR性能。