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Citation: LI An-ming, WEI Guang-cheng, HAO Qiao-hui, ZHAO Bin, ZHANG Qiu-lin. Effect of Mn content on the catalytic performance of CeO2-ZrO2-MnOx in the oxidation of toluene[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(2): 231-239. shu

Effect of Mn content on the catalytic performance of CeO2-ZrO2-MnOx in the oxidation of toluene

  • Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

  • Corresponding author: ZHAO Bin, 2859981152@qq.com ZHANG Qiu-lin, qiulinzhang_kmust@163.com
  • Received Date: 6 November 2019
    Revised Date: 23 January 2020

    Fund Project: the National Key R & D Program of China 2018YFC0213400The project was supported by the National Key R & D Program of China (2018YFC0213400)

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  • A series of CeO2-ZrO2-MnOx catalysts with different Mn contents (denoted as CZMX, where X is the molar fraction of MnOx) were prepared by the redox precipitation method; the effect of Mn content on the catalytic performance of CZMX in the oxidative degradation of toluene was then investigated. The results indicate that that the CZM0.6 catalyst exhibits the best performance in toluene oxidation; a complete conversion of toluene can be achieved at 230℃. The XRD results suggest that the crystallinity of CZMX decreases first, steps over the valley and then increases again with the increase of Mn content. From the H2-TPR characterization, in contrast, a volcanic tendency is observed for the interaction among Ce-Zr-Mn. In particular, the CZM0.6 catalyst displays poorest crystallinity and strongest Ce-Zr-Mn interaction, which can enhance the surface oxygen species. Meanwhile, the Raman and O2-TPD results prove that the abundant oxygen vacancies on the catalyst surface can promote the migration of surface active oxygen species and then enhance the catalytic performance of CZMX in toluene oxidation. In addition, the in-situ DRIFTS results illustrate that the reaction of toluene oxidation over the CeO2-ZrO2-MnOx catalysts proceeds via benzoic acid as the essential intermediate, which is rapidly converted to CO2 and H2O in the presence of O2.
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