文献类型：期刊文献

英文题名：Operando Raman Spectroscopy for Determining the Active Phase in One-Dimensional Mn_1-xCe_xO_2+y Nanorod Catalysts during Methane Combustion

作者：Xu, Jing[1];Li, Ping[1];Song, Xingfu[1];He, Chongheng[1];Yu, Jianguo[1];Han, Yi-Fan[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：1

期号：10

起止页码：1648

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000277976400026)】；

基金：The authors are grateful for the support from the Chinese Education Ministry III Project (B08021). the Non-Government International Cooperation Project of the Shanghai Ministry of Science and Technology (2010110230705900), the International Cooperation Project of the Chinese Ministry of Science and Technology (2007DFC61690), and the Opening Project of the State Key Laboratory of Chemical Engineering (SKL-ChE-08C05).

语种：英文

摘要：One-dimensional Mn1-xCexO2 +/- y nanorod catalysts were synthesized and characterized by X-ray diffraction (XRD) and operando Raman spectroscopy to determine the active phase during methane combustion. Thermal- and reaction-induced phase-transformation determined by operando Raman indicated that the MnOx domain in Mn1-xCexO2 +/- y is the active phase for methane combustion. Besides the peak near 458 cm(-1) attributed to F-2g mode in CeO2, two new features, corresponding to O vacancies between 590 and 610 cm(-1) and Mn3O4-like species (Mn-O-Mn) near 640 cm(-1) were observed for Mn1-xCexO2 +/- y nanocrystal catalysts. The number of O vacancies in CeO2 and the surface concentration of MnOx are mainly responsible for methane combustion. Moreover, Mn1-xCexO2 +/- y nanocrystal catalysts show superior activity and stability as compared to alpha-Mn2O3; especially. Mn0.6Ce0.4O2 +/- y exhibits the highest activity among all samples.