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Issue 12, 2016
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Mn3O4 doped with highly dispersed Zr species: a new non-noble metal oxide with enhanced activity for three-way catalysis

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Abstract

In this article, zirconium-doped manganese oxides have been synthesized through a one-step solvothermal method and used in three-way catalysis. Zr4+ was introduced into the lattice of Mn3O4 and was shown to be highly dispersed in the Mn3O4 matrix, as confirmed by XPS, Raman spectroscopy and EDS-Mapping. Appropriate Zr4+ doping resulted in lattice distortion, leading to the exposure of more oxygen vacancies and a better oxygen storage capacity (OSC: 658.8 μmol g−1) than pure Mn3O4 (163.2 μmol g−1). As non-noble metal three-way catalysts (TWCs) for a CO + NO + C2H6 model reaction, the catalytic activities of the as-synthesized samples were evaluated. Notably, the catalytic tests showed that the activities of the zirconium-doped samples are higher than that of pure Mn3O4. Furthermore, the ZM-2 sample (with a 20% Zr/Mn molar ratio) shows the best complete conversion of CO at 228 °C, NO at 334 °C and C2H6 at 400 °C (nearly 100 °C lower than those of pure Mn3O4) and excellent anti-high temperature performance. Our work will reduce the use of precious metals and provide a feasible route to prepare economical catalysts for exhaust emission control.

Graphical abstract: Mn3O4 doped with highly dispersed Zr species: a new non-noble metal oxide with enhanced activity for three-way catalysis

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Publication details

The article was received on 20 Jul 2016, accepted on 10 Oct 2016 and first published on 11 Oct 2016


Article type: Paper
DOI: 10.1039/C6NJ02272C
Citation: New J. Chem., 2016,40, 10108-10115
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    Mn3O4 doped with highly dispersed Zr species: a new non-noble metal oxide with enhanced activity for three-way catalysis

    G. Zhao, J. Li, W. Zhu, X. Ma, Y. Guo, Z. Liu and Y. Yang, New J. Chem., 2016, 40, 10108
    DOI: 10.1039/C6NJ02272C

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