催化作用
X射线光电子能谱
氮氧化物
选择性
化学
选择性催化还原
吸附
原位
沉积(地质)
氮气
无机化学
化学工程
燃烧
物理化学
有机化学
工程类
沉积物
古生物学
生物
作者
Meiqing Shen,Lili Xu,Jianqiang Wang,Chenxu Li,Wulin Wang,Jun Wang,Yanping Zhai
标识
DOI:10.1016/s1002-0721(16)60023-6
摘要
The effect of synthesis methods on the activity of V/Ce/WTi catalysts was investigated for the selective catalytic reduction (SCR) of NOx by NH3. V/Ce/WTi-DP (deposition precipitation) catalyst showed excellent NH3-SCR performance, especially the better medium-temperature activity and the less N2O formation than V/Ce/WTi-IMP (impregnation). These catalysts were characterized by X-ray diffraction (XRD), Brumauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (H2-TPR), and in situ DRIFTS techniques. The XPS and H2-TPR results revealed that V/Ce/WTi-DP exhibited more surface Ce species, higher level of Oα and higher reducibility of Ce species. Reflected by in situ DRIFTS results, the deposition precipitation method (DP) contributed to a greater amount of weakly adsorbed NO2, monodentate nitrate and NH3 species with better reactive activity. Meanwhile, the cis-N2O22– species, an intermediate for N2O formation, was very limited. As a result, these advantages brought about the superior SCR activity and N2 selectivity for V/Ce/WTi-DP.
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