Highly Dispersed Manganese Based Mn/N–C/Al2O3 Catalyst for Selective Oxidation of the C–H Bond of Ethylbenzene

  • Wan-Fei Xu
    Wan-Fei Xu
    CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
    More by Wan-Fei Xu
  • Wen-Jing Chen
    Wen-Jing Chen
    CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
  • De-Chang Li
    De-Chang Li
    CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
    More by De-Chang Li
  • Bin-Hai Cheng
    Bin-Hai Cheng
    CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
  • , and 
  • Hong Jiang*
    Hong Jiang
    CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
    *E-mail:[email protected]
    More by Hong Jiang
Cite this: Ind. Eng. Chem. Res. 2019, 58, 10, 3969–3977
Publication Date (Web):February 26, 2019
https://doi.org/10.1021/acs.iecr.8b05328
Copyright © 2019 American Chemical Society
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Abstract

The solvent-free oxidation of ethylbenzene to acetophenone with high conversion rate and selectivity is of great importance. Herein, a catalyst composed of nitrogen-doped carbon and mesoporous alumina supported manganese (Mn) was prepared by pyrolysis and calcination. We demonstrated its excellent catalytic activity (27.8%), selectivity (>99%), and stability (without a significant decrease over eight cycles) for the solvent-free oxidation of ethylbenzene with molecular oxygen. In the heterogeneous catalytic system, phenanthroline had two functions. First, it acted as a versatile chelating ligand to lock Mn and improve its dispersity. Second, it served as a nitrogen source to provide doped pyridine-N (9.4%), which promoted the adsorption and bond breaking of molecular oxygen. More abundant active Mn in the bulk phase than on the surface guaranteed the stability and reusability of the catalyst. Meanwhile, the mesoporous aluminum oxides provided a stable support for active components and adsorption sites for reactants.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.iecr.8b05328.

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