The novel CeO₂/TiO₂ catalysts were modified by W in this work. It revealed that W modification could significantly facilitate the capacity of CeO₂/TiO₂ catalyst for resisting Pb poisoning. And various characterizations were applied to explore the underlying resistance mechanism. XPS and H₂-TPR analysis revealed that the W modification promoted the transformation from surface Ce⁴⁺ to Ce³⁺. Then the increased surface Ce³⁺ along with highly dispersed W species provided more Brønsted acid sites for NH₃ adsorption on the surface of CeO₂/TiO₂ catalyst (NH₃-TPD and DFT). By XPS and NO+O₂ co-adsorption results, the oxidation of NO to NO₂ was motivated due to the increased surface chemisorbed oxygen. Furthermore, both E-R and L-H mechanisms were suitable for the NH₃-SCR reaction over CWT and CT catalysts according to in situ DRIFT analysis. The deposition of PbO merely inhibited the NH₃ and NO_x adsorption, while the NH₃-SCR mechanism wasn't changed.

在这项工作中，新型CeO ₂ /TiO ₂催化剂被W改性。结果表明，W改性可以显着提高CeO ₂ /TiO ₂催化剂抗Pb中毒的能力。并应用了各种表征来探索潜在的耐药机制。XPS 和H ₂ -TPR 分析表明，W 改性促进了从表面Ce ⁴⁺到Ce ³⁺的转变。然后，增加的表面的Ce ³⁺与高度分散的W¯¯物种一起提供多种布朗斯台德酸位点的NH ₃吸附的CeO的表面上₂ /的TiO ₂催化剂（NH_3- TPD 和 DFT）。根据 XPS 和 NO+O ₂共吸附结果，由于表面化学吸附氧的增加，NO 氧化为 NO ₂是有动机的。此外，根据原位漂移分析，ER 和 LH 机制均适用于CWT 和 CT 催化剂上的 NH ₃ -SCR 反应。PbO的沉积仅仅抑制了NH ₃和NO _{x 的}吸附，而NH ₃ -SCR机制没有改变。