A series of Zr_yTi_1-yO₂ (y = 0.1, 0.4, 0.5, 0.6 and 0.9) are prepared by co-precipitation method and Mn(NO₃)₂ is impregnated on them to achieve a 5 wt% Mn loading. The catalytic activity of MnO_x/Zr_yTi_1-yO₂ for the selective reduction of NO with ammonia (NH₃–SCR) in the range of 80–360 °C is evaluated by a fixed-bed reactor. The prepared catalysts are characterized by N₂ adsorption-desorption, XRD, XPS, H₂–TPR, NH₃–TPD and in situ DIRFTS. The results showed that different Zr/Ti ratios influence the NH₃–SCR activity of MnO_x/Zr_yTi_1-yO₂, but they have high N₂ selectivity at low temperature and similar changes in the range of 80–360 °C. MnO_x/Zr_0.6Ti_0.4O₂ achieves 80% of NO removal efficiency at 140 °C and can keep 100% from 200 to 360 °C, and it exhibits an excellent resistance of H₂O at 200 °C and a certain tolerance to SO₂. The pores of all prepared catalysts are composed of many mesopores with pore width centered at 4 nm and some micropores with pore width centered at 1.75 nm. MnO_x/Zr_0.4Ti_0.6O₂ has 344 m²/g of BET surface area, 0.42 cm³/g of total pore volume with 0.075 cm³/g of micropore volume, but MnO_x/Zr_0.6Ti_0.4O₂ has the highest contents of Mn⁴⁺ (52.0%) and O_β (32.8%) and more Lewis acid sites. Zr/Ti ratios change Mn valence and O species in MnO_x/Zr_yTi_1-yO₂, and Mn⁴⁺ can promote the adsorption of NH₃ and accelerates the formation of NH₄NO₃ to improve NO removal with NH₃ by L–H mechanism.

 通过共沉淀法制备一系列Zr _y Ti _{1- y} O ₂（y = 0.1、0.4、0.5、0.6和0.9），并在其上浸渍Mn（NO ₃）₂以实现5％的Mn负载量。 。通过固定床反应器评估了MnO _x / Zr _y Ti _{1- y} O ₂在80–360°C范围内用氨气（NH ₃ -SCR）选择性还原NO的催化活性。制备的催化剂的特征在于N ₂吸附-解吸，XRD，XPS，H ₂ -TPR，NH ₃ -TPD以及原位差异。结果表明，不同的Zr / Ti比会影响MnO _x / Zr _y Ti _{1- y} O ₂的NH ₃ -SCR活性，但它们在低温下具有较高的N ₂选择性，并且在80-360°范围内具有相似的变化C。MnO _x / Zr _0.6 Ti _0.4 O ₂在140°C时达到80％的NO去除效率，并且在200至360°C时可以保持100％，并且在200°C时具有出色的H ₂ O耐受性和一定的耐受性到SO ₂。所有制得的催化剂的孔均由许多中孔，其孔宽度以4 nm为中心，以及一些微孔中的孔宽度以1.75 nm为中心。的MnO _X / Zr的_0.4钛_0.6 ø ₂具有344米² / g的BET表面积的，0.42厘米³与0.075厘米总孔体积的/克³ / g的微孔体积的，但MnO的_X / Zr的_0.6钛_0.4 Ò ₂具有Mn ⁴⁺（52.0％）和_Oβ（32.8％）的含量最高，路易斯酸位点更多。Zr / Ti比改变MnO _x / Zr _y Ti中的Mn价和O物种_{1- ÿ} Ò ₂和Mn ⁴⁺可以促进NH的吸附₃和加速NH的形成₄ NO ₃，以提高NO脱除用NH ₃通过L-H机制。