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The enhanced Pb resistance of CeO2/TiO2 catalyst for selective catalytic reduction of NO with NH3 by the modification with W
Molecular Catalysis ( IF 3.9 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.mcat.2021.111839
Ye Jiang 1 , Lin Yang 1 , Da Han 1 , Zhengda Yang 1 , Congcong Su 1 , Riyi Lin 1 , Xinwei Wang 1 , Xinbo Zhu 2
Affiliation  

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 NOx adsorption, while the NH3-SCR mechanism wasn't changed.



中文翻译:

用W改性CeO2/TiO2催化剂对用NH3选择性催化还原NO的抗铅性能增强

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(NH3- 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。

更新日期:2021-09-08
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