MnO_x/TiO₂, MnO_x/ZrO₂ and MnO_x/ZrO₂–TiO₂ were prepared by impregnation and NO removal was evaluated in a fixed‒bed reactor under simulated reactive gas. All samples were characterized by various technologies. The results showed that MnO_x/ZrO₂–TiO₂ had good selective catalytic reduction activity between 80–360 °C and excellent resistance to H₂O at 200 °C for 30 h and achieved 80% NO_x removal efficiency at 140 °C. The NO removal efficiency of MnO_x/ZrO₂ was only 45–80%, and that of MnO_x/TiO₂ was 100% at 240–360 °C. However, their tolerance to H₂O was not as good as MnO_x/ZrO₂–TiO₂. When SO₂ was induced into reactive gas, the NO removal efficiency of MnO_x/ZrO₂ at 200 °C was maintained 70% for 34 h, but that of MnO_x/TiO₂ decreased rapidly. MnO_x/ZrO₂–TiO₂ maintained 100% NO removal efficiency for 5 h and decreased gradually. After SO₂ was stopped, NO removal ability wasn’t recovered, indicating that deactivation of catalyst was irreversible. TiO₂ can improve the texture properties, and the surface area and total pore volume of MnO_x/TiO₂ reached 313 m²/g and 0.38 m³/g. The existence of zirconium oxide significantly increased the concentration of Mn⁴⁺ and O_β on the surface of catalysts. MnO_x/ZrO₂–TiO₂ had wide surface acidity, which improved NH₃ adsorption. After SO₂ resistance testing, Mn⁴⁺ content on the surface of catalysts decreased whereas Mn³⁺ obviously increased. SO₂ could be oxidized by MnO_x to SO₃, and SO₃ was adsorbed on ZrO₂ or TiO₂ to form zirconium sulfate or titanyl sulfate. (NH₄)₂SO₄ was formed on singe ZrO₂ or TiO₂ carrier. These sulfates increased the surface acidity, resulting in a change of NO removal ability.

通过浸渍制备MnO _x / TiO ₂，MnO _x / ZrO ₂和MnO _x / ZrO ₂ -TiO ₂，并在模拟反应气体下在固定床反应器中评估NO的去除率。所有样品均采用各种技术进行了表征。结果表明，MnO _x / ZrO ₂ -TiO ₂在80-360°C之间具有良好的选择性催化还原活性，在200°C下30 h具有出色的抗H ₂ O性能，在140°C下达到80％的NO _x去除率。MnO _x / ZrO ₂的NO去除效率在240-360°C时，MnO _x / TiO _2的含量仅为45-80％，而100％为MnO _x / TiO ₂。但是，它们对H ₂ O的耐受性不如MnO _x / ZrO ₂ -TiO ₂。当SO ₂被引入反应气体中时，MnO _x / ZrO ₂在200°C下的NO去除效率保持70％达34 h，而MnO _x / TiO ₂的NO去除效率却迅速下降。MnO _x / ZrO ₂ -TiO ₂维持100％的NO去除效率达5 h，并逐渐降低。SO _2之后停止，没有去除能力恢复，表明催化剂的失活是不可逆的。TiO ₂可以改善织构性质，并且MnO _x / TiO ₂的表面积和总孔体积_分别达到313m ² / g和0.38m ³ / g。氧化锆的存在显著增加Mn的浓度⁴⁺和O _β催化剂的表面上。MnO _x / ZrO ₂ -TiO ₂具有较宽的表面酸性，从而改善了NH _3的吸附。经过SO ₂电阻测试后，Mn ⁴⁺催化剂表面的含量下降，而Mn ³⁺明显增加。SO ₂可以被MnO _x氧化为SO ₃，SO ₃吸附在ZrO ₂或TiO ₂上形成硫酸锆或硫酸氧钛。在单一的ZrO ₂或TiO ₂载体上形成了（NH ₄）₂ SO ₄。这些硫酸盐增加了表面酸度，导致NO去除能力的改变。