Bimetallic W_aCeO_x (a = 0.06, 0.12, 0.18, 0.24) catalysts were synthesized for selective catalytic reduction of NO_x with NH₃ (NH₃-SCR). The influences of W on structure, activity and surface properties were investigated by XRF, XRD, Raman, TEM, N₂ adsorption-desorption, H₂-TPR, O₂/NH₃/SO₂-TPD, XPS, and in-situ DRIFTS. The characterization results show that the W/Ce ratio has a great effect on the NH₃-SCR activity. The different catalytic activities of W_aCeO_x are mainly attributed to the acidity change, especially the increase of B-acid content plays a major role in enhancing low temperature activity. W_0.18CeO_x exhibits excellent low-temperature NH₃-SCR activity, SO₂/H₂O resistance and N₂ selectivity with a broad activity window (190–490 °C) with 5%H₂O. Moreover, good activity window (235–460 °C) can be maintained even the catalyst treated with 5% H₂O at 800 °C for 12 h, showing especial hydrothermal stability. Thus, it can be summarized that W_0.18CeO_x is regarded as outstanding catalyst for low-temperature NH₃-SCR of NO.

双金属W _a CeO _x (a = 0.06, 0.12, 0.18, 0.24)催化剂被合成用于用NH ₃ (NH ₃ -SCR)选择性催化还原NO _x。通过XRF、XRD、Raman、TEM、N ₂吸附-解吸、H ₂ -TPR、O ₂ /NH ₃ /SO ₂ -TPD、XPS和原位分析W对结构、活性和表面性质的影响漂移。表征结果表明W/Ce比对NH ₃ -SCR活性有很大影响。W _a CeO _x的不同催化活性主要归因于酸度的变化，尤其是 B-酸含量的增加对提高低温活性起主要作用。W _0.18 CeO _x表现出优异的低温 NH ₃ -SCR 活性、SO ₂ /H ₂ O 抗性和 N ₂选择性，具有较宽的活性窗口（190–490 °C）和 5%H ₂ O。此外，良好的活性窗口即使用 5% H ₂ O 在 800 °C 下处理 12 小时的催化剂也能保持 (235–460 °C) ，表现出特别的水热稳定性。因此，可以总结出W _0.18 CeO _x被认为是低温NH _{3 的}优秀催化剂- SCR 的 NO。