Effect of Rare Earth Metal (RE = La, Pr, Nd, Y) Doping on Co–Ce Composite Oxide and Its Application in Catalytic Combustion of Chlorobenzene

  • Lei Zhu
    Lei Zhu
    College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, China
    School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, China
    National Supervision and Testing Center of Fine Chemicals, Taizhou 225300, China
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  • Shunlong Pan
    Shunlong Pan
    School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, China
    More by Shunlong Pan
  • Zhiying Liu*
    Zhiying Liu
    School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, China
    *E-mail: [email protected]
    More by Zhiying Liu
  • Ping Wei
    Ping Wei
    College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, China
    More by Ping Wei
  • Zhuyun Liu
    Zhuyun Liu
    College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, China
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  • Peng Yu
    Peng Yu
    School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, China
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  • , and 
  • Yanhua Xu*
    Yanhua Xu
    School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, China
    *E-mail: [email protected]
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Cite this: Ind. Eng. Chem. Res. 2020, 59, 13, 5686–5698
Publication Date (Web):March 11, 2020
https://doi.org/10.1021/acs.iecr.9b07086
Copyright © 2020 American Chemical Society
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Abstract

Rare earth metal (RE = La, Pr, Nd, Y)-doped CoCeOx catalysts were prepared and evaluated for eliminating chlorobenzene (CB). Characterization results showed that the doped RE metal simultaneously acts as a structural and electronic assistant, which changes the coordination environment of Ce ions and enhances the interaction between Co and Ce species, thus improving the catalytic performance and chlorine resistance of CoCeOx. Besides, dynamic “redox gears” based on the Co/Ce redox couples were proposed. RE metal doping was found to promote the movement of “gears”, which led to increased surface active oxygen and oxygen mobility, accelerating the complete oxidation of CB and the rapid removal of deposited chlorine. CoCeYOx exhibited the best redox-promoting effect, with 90% CB conversion observed at 256 °C and reduced generation of dichlorobenzene. Moreover, the effect of gaseous oxygen on the CB oxidation process was also studied.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.iecr.9b07086.

  • XRD patterns of CoCeREOx–M (RE = La, Pr, Nd, Y) catalysts; Raman spectra of CoCeOx, CoCePrOx, and CoCeYOx catalysts; H2-TPR profiles of CoCeREOx–M (RE = La, Pr, Nd, Y) catalysts; initial H2 consumption rates of CoCeOx and CoCeREOx (RE = La, Pr, Nd, Y) catalysts; Y 3d (A), La 3d (B), Nd 3d (C), and Pr 3d (D) XPS spectra of the corresponding CoCeREOx (RE = La, Pr, Nd, Y) catalyst; catalytic activity of Co3O4 and CoCeREOx–M (RE = La, Pr, Nd, Y) for CB combustion; reaction rate of CB oxidation normalized by specific surface area (PDF)

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