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Catalytically active ceria-supported cobalt-manganese oxide nanocatalysts for oxidation of carbon monoxide.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wang, Xu Du, Lin-Ying Du, Meng Ma, Chao Zeng, Jie Jia, Chun-Jiang |
| Copyright Year | 2017 |
| Abstract | A low-concentration cobalt (∼6 at%) and manganese (∼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 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 (∼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. |
| Starting Page | 14533 |
| Ending Page | 14542 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/c7cp02004j |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c7/cp/c7cp02004j/c7cp02004j1.pdf |
| Alternate Webpage(s) | http://sinap.cas.cn/xwzx/kydt/201801/P020180112419980027670.pdf |
| PubMed reference number | 28537308 |
| Alternate Webpage(s) | https://doi.org/10.1039/c7cp02004j |
| Journal | Medline |
| Volume Number | 19 |
| Issue Number | 22 |
| Journal | Physical chemistry chemical physics : PCCP |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
