Mn_0.1Ce_0.9O_x and a series of Nb_mMn_0.1−mCe_0.9O_x catalysts with different Nb doping ratios were successfully synthesized by the citric acid method. Experimental results indicated that the catalytic performances of the Nb_mMn_0.1−mCe_0.9O_x were significantly ameliorated by Nb modification. In particular, the Nb_0.06Mn_0.04Ce_0.9O_x catalyst exhibited over 90% NO conversion in the temperature range of 175–325 °C and had good resistance to SO₂&H₂O. The characterization results revealed that Nb_0.06Mn_0.04Ce_0.9O_x exhibited a larger specific surface area, superior surface acidity and redox property, higher Mn⁴⁺ and oxygen vacancy contents compared to Mn_0.1Ce_0.9O_x. Furthermore, the more active ad-NH₃ and ad-NO_x species on the Nb_0.06Mn_0.04Ce_0.9O_x sample also greatly accelerated the NH₃-SCR reaction on it.

采用柠檬酸法成功合成了不同Nb掺杂比的Mn _0.1 Ce _0.9 O _x和一系列Nb _m Mn _0.1−m Ce _0.9 O _{x催化剂。}实验结果表明 Nb _m Mn _0.1−m Ce _0.9 O _x的催化性能通过 Nb 改性得到显着改善。特别是，Nb _0.06 Mn _0.04 Ce _0.9 O _x催化剂在 175-325 ℃的温度范围内表现出超过 90% 的 NO 转化率，并具有良好的 SO _2抗性。&H ₂ O。表征结果表明，与Mn _0.1 Ce _0.9 O _{x相比，Nb 0.06} Mn _0.04 Ce _0.9 O _x表现出更大的比表面积、优异的表面酸性和氧化还原性能、更高的Mn ⁴⁺和氧空位含量。此外， Nb _0.06 Mn _0.04 Ce _0.9 O _x样品上更活跃的ad-NH ₃和ad-NO _x物种也大大加速了其上的NH ₃ -SCR反应。