文献类型：期刊文献

英文题名：Operando Raman spectroscopy for determining the active phase in one- dimensional Mn1- xCexO2±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] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, 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：EI(收录号：20102212961766)

语种：英文

外文关键词：Cerium oxide - Combustion - Manganese oxide - Methane - Nanocatalysts - Raman spectroscopy - Nanocrystals - Catalyst activity - Nanorods

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 Mn 1-xCexO2±y is the active phase for methane combustion. Besides the peak near 458 cm-1 attributed to F2g mode in CeO2, two new features, corresponding to O vacancies between 590 and 610 cm-1 and Mn3O 4-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, Mn 1-xCexO2±y nanocrystal catalysts show superior activity and stability as compared to α-Mn2O 3; especially, Mn0.6Ce0.4O2±y exhibits the highest activity among all samples. ? 2010 American Chemical Society.