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One Step Template-Free Synthesis of Mesoporous MnOx/CeO2 Nanocomposite Oxides with Enhanced Low Temperature Catalytic Activity for CO and Hydrocarbon Oxidation

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Abstract

A green environment-friendly preparation method with template-free facile redox precipitation strategy was proposed to synthesize a series of mesoporous MnOx/CeO2 nano-composite oxides and were applied to catalytic oxidation diesel engine exhaust of CO and CH. The catalysts were characterized by XRD, N2 adsorption–desorption, TEM/SEM, XPS, H2-TPR and O2-TPO. Among these catalysts, the optimized sample MnOx/CeO2-64 achieved high catalytic activity (CO: T100 = 150 °C; C3H6: T100 = 190 °C; C3H8: T100 = 230 °C) and good durability. The superior catalytic activity of the catalyst could be ascribed to the generation of a large number of active oxygen species due to a synergetic catalytic effect between Ce/Mn with multiple oxidation states. The results of H2-TPR and O2-TPO indicated that stronger redox capacity contributed to the excellent catalytic oxidation performance. In addition, a possible reaction pathway was proposed for clarification this catalytic process.

Graphical Abstract

We propose a facile template-free strategy to prepare mesoporous nano-composites by one step redox precipitation method using H2O2 as reductant-oxidant, which shows the advantages of mild condition, simple process and environmental protection.

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Acknowledgments

This research was sponsored by National Key Basic Research Program of China (2013CB933202), China National Funds for Distinguished Young Scientists (51225202) and National Natural Science Foundation of China (51502330).

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Authors and Affiliations

  1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China

    Zhiguo Xie, Xiaoxia Zhou, Han Zhao, Yan Liu & Hangrong Chen

  2. The Key Laboratory of Resource Chemistry of Ministry of Education and the Shanghai Key Laboratory of the Rare Earth Functional Materials, Shanghai Normal University, Shanghai, 200234, People’s Republic of China

    Zhiguo Xie & Huixia Wu

  3. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Jiangsu, People’s Republic of China

    Hangrong Chen

Authors
  1. Zhiguo Xie
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  2. Xiaoxia Zhou
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  3. Huixia Wu
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  4. Han Zhao
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  5. Yan Liu
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  6. Hangrong Chen
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Corresponding authors

Correspondence to Xiaoxia Zhou or Huixia Wu.

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Xie, Z., Zhou, X., Wu, H. et al. One Step Template-Free Synthesis of Mesoporous MnOx/CeO2 Nanocomposite Oxides with Enhanced Low Temperature Catalytic Activity for CO and Hydrocarbon Oxidation. Catal Lett 146, 1355–1360 (2016). https://doi.org/10.1007/s10562-016-1761-2

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  • DOI: https://doi.org/10.1007/s10562-016-1761-2

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