催化作用
氧化还原
化学
活动站点
结块
选择性催化还原
原位
氮氧化物
无机化学
化学工程
物理化学
有机化学
燃烧
工程类
作者
Fei Wang,Chunxue Wang,Ke Zhao,Yulong Shan,Yixing Ma,Chi Wang,Zhilin Li,Xin Sun,Kai Li,Hong He,Ping Ning
标识
DOI:10.1016/j.seppur.2022.121864
摘要
Ce based catalyst is one of the most important NH3-SCR catalysts. It has been widely recognized that Ce3+ plays a crucial role in NH3-SCR reaction. However, the specific atomic sites for anchoring Ce atoms and the chemical mechanism underlying the formation of Ce3+ in CeO2 are still incompletely known. Herein, we demonstrate that there are abundant hydroxyl groups on the surface of UiO-66, which are the anchoring sites of Ce. As the loading continues to increase, the insufficiently anchored Ce species will agglomerate and induce the formation of Ce3+-rich CeO2 clusters, which served as the redox sites in 10%Ce/UiO-66. On this basis, the strong interaction between W and CeO2 was used to introduce highly dispersed acidic sites (WO3) around CeO2, and thus the redox site and the acidic site are tightly coupled. In situ DRIFTS results revealed that the NH3-SCR reaction pathway followed L-H mechanism on 10%Ce-10%W/UiO-66 catalyst, which is likely to be an important factor for the improved catalytic activity and stability.
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