A series of WO₃ modified iron-titanate mixed metal oxides catalysts (the molar ratio of Fe/Ti = 4:1) were synthesized by conventional impregnation method and tested for selective catalytic reduction of NO_x by NH₃. The addition of WO₃ species could enhance the catalytic performance of FeTiO_x and 6 W/FeTiO_x showed optimal activity with above 80 % NO conversion under a wide operating temperature window of 200-400 °C. It also exhibited excellent stability in the presence of H₂O and SO₂ at 250 °C, even as low as 225 °C, which provided a suitable deNO_x candidate for stationary sources. The characterization methods including XRD, BET, XPS, H₂-TPR, NH₃-TPD, NO-TPD and in situ DRIFTs were used to investigate the structure and surface properties of catalysts and their influence on the catalytic activity. The results demonstrated that the impregnation of WO₃ species led to the strong electronic inductive effects between Fe³⁺and W⁶⁺, Ti⁴⁺ and W⁶⁺ in the forms of Fe⁽³⁺ⁿ⁾⁺-O-W^(6-n)+ and Ti⁽⁴⁺ⁿ⁾⁺-O-W^(6-n)+ structures, increasing the ratio of chemical adsorbed oxygen species, surface OH-, which were stimulative to low-temperature NH₃-SCR reaction. The increased amount of surface Brønsted acid sites mainly came from W-OH species. Besides, the reaction pathway over 6 W/FeTiO_x mainly followed Eley-Rideal mechanism at 225 °C through the reaction between gaseous NO and adsorbed NH₃ species.

一系列的WO ₃改性铁的钛酸混合金属氧化物催化剂（铁/钛= 4的摩尔比：1）用常规浸渍法合成，对NO的选择性催化还原测试_X由NH ₃。WO ₃的加入可以增强FeTiO _x的催化性能，在200-400°C的宽工作温度范围内，6 W / FeTiO _x表现出最佳的活性，NO转化率超过80％。它在H的存在下也显示出优异的稳定性₂ O和SO ₂，在250℃，甚至低到225℃，这提供了合适的DENO _X固定源的候选者。利用XRD，BET，XPS，H ₂ -TPR，NH ₃ -TPD，NO-TPD和原位DRIFT等表征方法研究了催化剂的结构和表面性质及其对催化活性的影响。结果表明，WO ₃的浸渍导致Fe ^{（3 + n）+} -OW ^{（6-n ）}形式的Fe ³⁺与W ⁶⁺，Ti ⁴⁺和W ⁶⁺之间的强电子感应作用。^）+和Ti ^{（4 + n）+} -OW ^（6-n）+结构，增加了化学吸附的氧种类，表面OH-的比例，这对低温NH ₃ -SCR反应具有促进作用。表面布朗斯台德酸位点的增加主要来自W-OH物种。此外，在6 W / FeTiO _x上的反应途径主要是通过气态NO与吸附的NH ₃的反应，在225°C下遵循Eley-Rideal机理。