Three Mn–Ce–O_x/TiO₂ mixed oxides (MCT) were prepared by sol–gel (SG), citric acid complexing (CA), and co-precipitation (CP) methods and used as catalysts for selective catalytic reduction of NO with NH₃ (NH₃-SCR) at low temperatures (75–200 °C). The physicochemical properties of the prepared catalysts were investigated by N₂ adsorption, X-ray diffraction (XRD), temperature-programmed reduction by H₂ (H₂-TPR), adsorption of NH₃ and NO followed by temperature-programmed desorption (NH₃/NO-TPD), X-ray photoelectron spectroscopy (XPS), and in situ diffuse-reflectance infrared Fourier transform (DRIFT) spectroscopy. The results show that both the low-temperature de-NO_x activity and the resistance to SO₂ poisoning of the Mn–Ce–O_x/TiO₂ catalyst decrease in the order of MCT-CP > MCT-SG > MCT-CA. These disparities can be mainly attributed to the difference in specific surface area, fractions of Mn⁴⁺ (Mn⁴⁺/(Mn²⁺+Mn³⁺+Mn⁴⁺)) and surface adsorbed oxygen (surface adsorbed oxygen/(surface adsorbed oxygen + lattice oxygen)) species, and the adsorption capacity for NH₃ and NO of the different catalysts.

The effect of preparation methods (sol–gel, citric acid complexing, and co-precipitation) on the performance of Mn–Ce–O_x/TiO₂ catalyst was investigated. The catalyst prepared by co-precipitation exhibits higher low-temperature activity and better SO₂ resistance than the counterparts prepared by the other two methods.

通过溶胶-凝胶法（SG），柠檬酸络合法（CA）和共沉淀法（CP）制备了三种Mn-Ce-O _x / TiO ₂混合氧化物（MCT），并用作催化剂以选择性催化还原NO在低温（75–200°C）下使用NH ₃（NH ₃ -SCR）。通过N ₂吸附，X射线衍射（XRD），H ₂程序升温还原（H ₂ -TPR），NH ₃和NO吸附，然后程序升温脱附（NH ）考察了制备的催化剂的理化性质。₃/ NO-TPD），X射线光电子能谱（XPS）和原位漫反射红外傅里叶变换（DRIFT）光谱。结果表明，无论是低温脱NO _X活性和抗SO ₂中毒锰铈-O的_X /二氧化钛₂在MCT-CP> MCT-SG> MCT-CA的顺序催化剂降低。这些差异主要可归因于比表面积，Mn ⁴⁺（Mn ⁴⁺ /（Mn ²⁺ + Mn ³⁺ + Mn ⁴⁺））的分数和表面吸附的氧（表面吸附的氧/（表面吸附的）氧+晶格氧））种类，以及对NH ₃的吸附能力 和不同催化剂的NO。

研究了制备方法（溶胶-凝胶，柠檬酸络合和共沉淀）对Mn-Ce-O _x / TiO ₂催化剂性能的影响。与其他两种方法制得的催化剂相比，通过共沉淀制得的催化剂具有更高的低温活性和更好的抗SO ₂性能。