کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
59493 | 1419428 | 2015 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of Y on improving the thermal stability of MnOx-CeO2 catalysts for diesel soot oxidation Effect of Y on improving the thermal stability of MnOx-CeO2 catalysts for diesel soot oxidation](/preview/png/59493.png)
A series of MnOx-CeO2-Y2O3 catalysts with different Y loadings (0, 1, 3, 6, and 10 wt%) were prepared by a co-precipitation method and investigated for NOx-assisted soot oxidation. The thermal stabilities of these catalysts were evaluated by treating them at 800 °C for 12 h under dry air flow. The catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, Raman spectroscopy, H2 temperature-programmed reduction, oxygen storage capacity, NO temperature-programmed oxidation, X-ray photoelectron spectroscopy, and soot temperature-programmed oxidation. The addition of Y led to decreased BET surface areas and poor low-temperature reduction abilities and oxygen storage capacities, which affected NO and soot oxidation activities. However, after aging, the doping of Y had effectively enhanced the stability of the catalytic activities for NO and soot oxidations, where the addition of 6%–10% Y achieved the optimum result because the maximal soot oxidation rate temperature was increased by only 34–35 °C. Additionally, the catalytic activity and deactivation of MnOx-CeO2-containing catalysts were closely related to the presence of Mn4+ and oxygen species on the surface.
Graphical AbstractAddition of Y to MnOx-CeO2 improves thermal stability of the catalytic activity for soot oxidation, and 6%–10% Y exhibits the optimal best result. The activity and thermal deactivation of the catalysts are closely related to the presence of Mn4+ species.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 36, Issue 8, August 2015, Pages 1333–1341