催化作用
氮氧化物
选择性催化还原
X射线光电子能谱
空间速度
化学
核化学
离子
原位
无机化学
化学工程
选择性
物理化学
有机化学
燃烧
工程类
作者
Na Zhu,Zhihua Lian,Yan Zhang,Wenpo Shan,Hong He
标识
DOI:10.1016/j.apsusc.2019.03.336
摘要
In this study, a Cu/SAPO-18 catalyst was treated by H2 reduction, which induced a remarkable enhancement of the low-temperature NH3-SCR activity. Compared with the fresh catalyst, the reduced Cu/SAPO-18 catalyst showed an increase in NOx conversion from 45% to 80% at 175 °C, and from 80% to 100% at 200 °C, under a GHSV of 200,000 h−1. The characterization (XRD, XPS and H2-TPR) and in-situ DRIFTS results confirmed that a large amount of Cu cations (most of which were Cu+ ions) existed on/in Cu/SAPO-18 after the H2 reduction treatment. The increased Cu+/Cu2+ ratio led to the enhanced low-temperature SCR activity.
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