Abstract
To study the oxygen vacancies evolvement on the single component and the bi-components manganese oxides, two manganese oxide precursors (Mn5O8 and MnO2–Mn3O4) with similar Mn/O ratio were prepared and were treated by air, N2, and Ar, respectively. The morphology, composition and structure of the prepared samples were characterized by FE–SEM, XRD, XPS, EPR, STEM, STEM-EDS and N2 adsorption–desorption. The valence state evolvement indicates that the Mn5O8 and MnO2–Mn3O4 are all transformed into MnO, Mn3O4 and MnO1.88 with different proportions. The results showed that the oxygen vacancies contents of the as-prepared samples are not only related to the treating atmosphere but also heavily dependent on the atom ratios of Mn and O of the precursors. Compared with the heat treated MnO2–Mn3O4, the heat treated Mn5O8 presented higher oxygen vacancies content and more Mn atoms dislocating structure, suggesting that the single component Mn5O8 is helpful to promoting the formation of defects. These findings reveal that the single component Mn5O8 is helpful to the formation of oxygen vacancies, ultimately resulting in an enhanced catalytic combustion performance of toluene.
Graphical Abstract
The oxygen vacancies evolvement of the single component and the bi-components manganese oxides were explored. Compared with the nanorods-Ar, the spindles-Ar shows more oxygen vacancies and dislocating Mn atoms, and enhanced catalytic combustion performance of toluene.
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Acknowledgements
This work is supported by National Nature Science Foundation of China (51572004, 51202003 and 21471002), Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (KJ2016SD06), Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education (2016KY11-048), Natural Science Fund for Distinguished Young Scholars from Anhui Polytechnic University (2016JQ01) and National College Student Innovation Imbark Training Program Foundation of China (201510363084 and 2016103630051).
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Yang, R., Ren, C., Teng, X. et al. Study of the Surface Oxygen Vacancies Evolvement on the Single and Bi-Components Manganese Oxide Precursors and their Catalytic Performance. Catal Lett 147, 727–737 (2017). https://doi.org/10.1007/s10562-017-1973-0
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DOI: https://doi.org/10.1007/s10562-017-1973-0