介孔材料
催化作用
沸石
ZSM-5型
介孔二氧化硅
材料科学
化学工程
壳体(结构)
过程(计算)
芯(光纤)
无机化学
化学
复合材料
有机化学
工程类
操作系统
计算机科学
作者
Lei Zhang,Tianyu Du,Hongxia Qu,Bin Chi,Qin Zhong
标识
DOI:10.1016/j.cej.2016.12.108
摘要
As an excellent NH3-SCR catalyst, Fe-ZSM-5 suffered from its inferior performance at lower temperature region. Efforts have been made to improve the low/medial-temperature reaction rate of it. In this work, a sequential reaction strategy relied on a core-shell structure zeolite with Fe-ZSM-5 core and ceria loaded mesoporous-silica shell was proposed. It was confirmed that a considerable portion of NO was pre-oxidized to NO2 when the mixture gas passed through the ceria loaded mesoporous silica shell which leads to the occurrence of fast-SCR process on Fe-ZSM-5 core. As expected, the ceria loaded mesoporous-silica shell acted as an oxidation reactor for NO and the Fe-ZSM-5 core was the real location where fast-SCR took place. To emphasize such a sequential reaction, the process of diffusion and the necessity of ceria loaded mesoporous silica shell were further discussed and confirmed by TPD and in situ DRIFTS.
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