Double redox couples manganese oxide nanorods with tunable oxygen defects and their catalytic combustion properties
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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.
KeywordsManganese oxides Redox couples Oxygen vacancies Catalytic oxidation Nanostructured catalysts
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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Conflict of interest
The authors declare that they have no conflict of interest.
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