氮氧化物
催化作用
选择性催化还原
钼
氨
金属
化学
兴奋剂
无机化学
钨
氨生产
氧化物
材料科学
物理化学
有机化学
光电子学
燃烧
作者
Shan Yang,Xiaoyue Zhu,Shurui Chen,Xinhui Zhu,Hao Liu,Jianjun Chen,Dezhan Chen,Chuanzhi Sun,Junhua Li
标识
DOI:10.1021/acscatal.4c00043
摘要
The application of selective catalytic reduction with ammonia (NH3-SCR) technology urgently requires catalysts with good performance to control nitrogen oxide (NOx, x = 1, 2) emissions, and structural analysis of such catalysts is necessary and crucial to elucidate the performance of catalytically active sites. Thus, we prepared molybdenum (Mo)-doped CeO2 catalysts to achieve a substantial leap in catalytic performance. The results revealed that the emergence of Ce3+–O–Ce3+ structural units induced by Mo doping achieved the low-energy barrier activation of the NH3 molecule, which transformed the dominant reaction mechanism in the catalytic reaction and thus led to a much better SCR performance. Furthermore, we designed tungsten (W)-doped CeO2 catalysts with the same doping amount as Mo and found that the catalysts exhibited almost the same activity trend as the Mo-doped CeO2 catalysts, which further confirmed the pivotal role of the Ce3+–O–Ce3+ structural units. This study provides a basic theoretical foundation for the design of ceria-based SCR catalysts with efficient catalytic performance for NOx removal.
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