Catalytically active ceria-supported cobalt-manganese oxide nanocatalysts for oxidation of carbon monoxide
Wang, X; Du, LY; Du, M; Ma, C; Zeng, J; Jia, CJ; Si, R
2017
发表期刊PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
卷号19期号:22页码:14533-14542
文章类型期刊论文
摘要A low-concentration cobalt (similar to 6 at%) and manganese (similar to 3 at%) bimetallic oxide catalyst supported on ceria nanorods (CoMnOx/CeO2), as well as its related single metal oxide counterparts (CoOx/CeO2 and MnOx/CeO2) was synthesized via a deposition-precipitation approach. The fresh samples after air-calcination at 400 C-omicron were tested under the reaction conditions of CO oxidation, and showed the following order of reactivity: CoMnOx/CeO2 > CoOx/CeO2 > MnOx/CeO2. X-ray diffraction (XRD) and transmission electron microscopy (TEM) data identified that the structure of the CeO2 support was maintained during deposition of metal (Co, Mn) ions while the corresponding vis-Raman spectra verified that more oxygen vacancies were created after deposition-precipitation than those in pure ceria nanorods. Aberration-corrected, high-angle, annular dark-field scanning transmission electron microscopy (HAADF-STEM) images with the help of electron energy loss spectroscopy (EELS) analyses determined two types of cobalt species, i.e. ultra-fine clusters (< 2 nm) and smaller nanocrystals (up to 5 nm) in CoOx/CeO2 while only bigger nanostructures (similar to 10 nm) of cobalt-manganese oxides in CoMnOx/CeO2. X-ray absorption fine structure (XAFS) measurements demonstrated the presence of a cubic Co3O4 phase in all the cobalt-based catalysts. The fitting results of the extended X-ray absorption fine structure (EXAFS) indicated that the introduction of the secondary metal (Mn) oxide significantly enhanced the two-dimensional growth of cobalt oxide nanostructures on the surface of CeO2. Therefore, the enhanced activity of CO oxidation reaction over the bimetallic cobalt-manganese oxide nanocatalyst can be attributed to the higher crystallinity of the Co3O4 phase in this work.
关键词Temperature Co Oxidation Water-gas Shift Calcination Temperature Selective Synthesis Mixed-oxide Catalysts Oxygen Co3o4 Performance Reactivity
DOI10.1039/c7cp02004j
关键词[WOS]TEMPERATURE CO OXIDATION ; WATER-GAS SHIFT ; CALCINATION TEMPERATURE ; SELECTIVE SYNTHESIS ; MIXED-OXIDE ; CATALYSTS ; OXYGEN ; CO3O4 ; PERFORMANCE ; REACTIVITY
收录类别SCI
语种英语
WOS记录号WOS:000403327200036
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/28571
专题中科院上海应用物理研究所2011-2018年
推荐引用方式
GB/T 7714
Wang, X,Du, LY,Du, M,et al. Catalytically active ceria-supported cobalt-manganese oxide nanocatalysts for oxidation of carbon monoxide[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2017,19(22):14533-14542.
APA Wang, X.,Du, LY.,Du, M.,Ma, C.,Zeng, J.,...&Si, R.(2017).Catalytically active ceria-supported cobalt-manganese oxide nanocatalysts for oxidation of carbon monoxide.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,19(22),14533-14542.
MLA Wang, X,et al."Catalytically active ceria-supported cobalt-manganese oxide nanocatalysts for oxidation of carbon monoxide".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19.22(2017):14533-14542.
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