Erbium (Er) has been used as a novel dopant to modify FeMn/TiO₂ catalyst for the selective catalytic reduction of NO with NH₃. The optimized Er_xFeMn/TiO₂ catalyst exhibited excellent catalytic performance at low temperature under a high space velocity of 30,000 h⁻¹. The temperature window for NO conversion efficiency higher than 80% ranged from 100 to 240 °C. The catalysts were characterized using XRD, BET, H₂-TPR, NH₃-TPD, XPS, TGA and In-situ DRIFT. The results showed that Er modification on FeMn/TiO₂ catalysts increased the specific surface area, dispersion, reducibility, Mn⁴⁺ concentration, and especially the concentration of Lewis acid sites and surface chemisorbed labile oxygen, resulting in an excellent catalytic performance at low temperature. Additionally, Er modification also restrained the formation of sulfate sulfate and/or bisulfate salts, which improved the resistance to SO₂ and H₂O of the catalyst.

（（Er）已被用作新型掺杂剂来改性FeMn / TiO ₂催化剂，用于用NH ₃选择性催化还原NO 。优化的铒_X的FeMn /二氧化钛₂催化剂在低温下的30000高的空间速度下表现出优异的催化性能 ħ ^-1。NO转化效率高于80％的温度范围为100至240°C。使用XRD，BET，H ₂ -TPR，NH ₃ -TPD，XPS，TGA和原位DRIFT表征催化剂。结果表明，在FeMn / TiO ₂催化剂上进行Er改性可提高比表面积，分散性，还原性，Mn ⁴⁺浓度，尤其是路易斯酸位的浓度和表面化学吸附的不稳定氧的浓度，导致在低温下具有出色的催化性能。另外，Er改性还抑制了硫酸盐硫酸盐和/或硫酸氢盐的形成，这提高了催化剂对SO ₂和H ₂ O的耐受性。