Surface reactive species on MnO_x(0.4)-CeO_2 catalysts towards soot oxidation assisted with pulse dielectric barrier discharge  

作　　者：付名利 林俊敏 朱文波 吴军良 陈礼敏 黄碧纯 叶代启 

机构地区：[1]College of Environment and Energy,South China University of Technology [2]Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control [3]Guangdong High Education Engineering Technology Research Center for Air Pollution Control [4]Key Lab of Ministry of Education for Pollution Control and Ecosystem Restoration in Industry Clusters

出　　处：《Journal of Rare Earths》2014年第2期153-158,共6页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China(51108187,50978103,21207039);Guangdong High Education Engineering Technology Research Center for Air Pollution Control Program(GCZX-A0903);the Fundamental Research Funds for the Central Universities(2012ZM0041)

摘　　要：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.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.

关 键 词：diesel soot MnOx（0.4）-Ce02 pulse dielectric barrier discharge reactive species rare earths 

分 类 号：O643.36[理学—物理化学]