Surface reactive species on MnOx（0.4）-CeO2 catalysts towards soot oxidation assisted with pulse dielectric barrier discharge

MnOx（0.4）-CeO2 was investigated for soot oxidation assisted with a pulse dielectric barrier discharge （DBD）. The catalysts were evaluated and characterized with TPO （temperature programmed oxidation）, X-ray diffraction （XRD）, Raman and X-ray photo- electron spectroscopy （XPS）. The ignition temperatu...

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Published in中国稀土学报：英文版 Vol. 32; no. 2; pp. 153 - 158
Main Author 付名利 林俊敏 朱文波 吴军良 陈礼敏 黄碧纯 叶代启
Format Journal Article
LanguageEnglish
Published 2014
Subjects
X-射线光电子能谱
介质阻挡放电
氧化锰
碳烟氧化
程序升温氧化
脉冲
表面活性物质
铈催化剂
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Summary:MnOx（0.4）-CeO2 was investigated for soot oxidation assisted with a pulse dielectric barrier discharge （DBD）. The catalysts were evaluated and characterized with TPO （temperature programmed oxidation）, X-ray diffraction （XRD）, Raman and X-ray photo- electron spectroscopy （XPS）. The ignition temperature Ti for soot oxidation decreased from 240.8 to 216.4 ℃ with the increase of the pulse DBD frequencies from 50 to 400 Hz, lower than that of the case without pulse DBD present （253.4 ℃）. The results of XRD, Raman and XPS agreed well with the TPO activities of MnOx（0.4）-CeO2 towards soot oxidation. More solid solution of ceria and manganese, and surface reactive species including 02 , O and Mn4＋ were responsible for the enhancement of soot oxidation due to pulse DBD injection in the present study. For solid solution favors to the activation and transformation of those species, which are be- lieved to be involved in the soot oxidation in a hybrid catalysis-plasma.
Bibliography:diesel soot; MnOx（0.4）-Ce02; pulse dielectric barrier discharge; reactive species; rare earths
MnOx（0.4）-CeO2 was investigated for soot oxidation assisted with a pulse dielectric barrier discharge （DBD）. The catalysts were evaluated and characterized with TPO （temperature programmed oxidation）, X-ray diffraction （XRD）, Raman and X-ray photo- electron spectroscopy （XPS）. The ignition temperature Ti for soot oxidation decreased from 240.8 to 216.4 ℃ with the increase of the pulse DBD frequencies from 50 to 400 Hz, lower than that of the case without pulse DBD present （253.4 ℃）. The results of XRD, Raman and XPS agreed well with the TPO activities of MnOx（0.4）-CeO2 towards soot oxidation. More solid solution of ceria and manganese, and surface reactive species including 02 , O and Mn4＋ were responsible for the enhancement of soot oxidation due to pulse DBD injection in the present study. For solid solution favors to the activation and transformation of those species, which are be- lieved to be involved in the soot oxidation in a hybrid catalysis-plasma.
11-2788/TF
ISSN:1002-0721
2509-4963