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Double redox couples manganese oxide nanorods with tunable oxygen defects and their catalytic combustion properties

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Abstract

The activation process of oxygen is a key step for catalytic oxidation reaction. To accelerate the activation of oxygen, tris-valences manganese oxides with two redox couples of Mn2+/Mn3+ and Mn3+/Mn4+ were constructed. The introduction of Zn promoted an enhanced Mn3+/(Mn2++Mn3++Mn4+) ratio and then produced an appropriate stoichiometric compositions for the Mn2+/Mn3+ and Mn3+/Mn4+ redox couples. The results indicate that oxygen vacancies, as a significant influence factor for catalytic oxidation, heavily rely on the Mn3+ content of the resultant samples. Based on the double redox couples with suitable stoichiometry, the metal ion modified tris-valences manganese oxides presented an enhanced oxygen vacancies content and a better catalytic performance for toluene oxidation compared with the unmodified sample. This study offers a promising route to construct the manganese oxides with two redox couples synchronously with an enhanced Mn3+/(Mn2++Mn3++Mn4+) ratio and oxygen vacancies, resulting in a decreased activating temperature and an increased catalytic performance.

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Funding

This study is funded by the National Nature Science Foundation of China (51,572,004 and 21,504,001), Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (KJ2016SD06), Top-notch Talent Cultivation Plan of Anhui Polytechnic University (2016BJRC002), and Natural Science Fund for Distinguished Young Scholars of Anhui Polytechnic University (2016JQ01).

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Correspondence to Renchun Yang.

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Li, Y., Wang, H., Zhang, R. et al. Double redox couples manganese oxide nanorods with tunable oxygen defects and their catalytic combustion properties. J Nanopart Res 21, 136 (2019). https://doi.org/10.1007/s11051-019-4569-3

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  • DOI: https://doi.org/10.1007/s11051-019-4569-3

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