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

LI An-ming; WEI Guang-cheng; HAO Qiao-hui; ZHAO Bin; ZHANG Qiu-lin

Volume 48 Issue 2

Feb. 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(2): 231-239

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.

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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-MnO_x in the oxidation of toluene[J]. Journal of Fuel Chemistry and Technology, 2020, 48(2): 231-239.

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

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

Funds:

the National Key R & D Program of China 2018YFC0213400

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Corresponding author: ZHAO Bin, 2859981152@qq.com; ZHANG Qiu-lin, qiulinzhang_kmust@163.com
Received Date: 2019-11-06
Rev Recd Date: 2020-01-23

Available Online: 2021-01-23

Publish Date: 2020-02-10

Abstract

Abstract

A series of CeO₂-ZrO₂-MnO_x catalysts with different Mn contents (denoted as CZM_X, where X is the molar fraction of MnO_x) were prepared by the redox precipitation method; the effect of Mn content on the catalytic performance of CZM_X in the oxidative degradation of toluene was then investigated. The results indicate that that the CZM_0.6 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 CZM_X 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 CZM_0.6 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 CZM_X in toluene oxidation. In addition, the in-situ DRIFTS results illustrate that the reaction of toluene oxidation over the CeO₂-ZrO₂-MnO_x catalysts proceeds via benzoic acid as the essential intermediate, which is rapidly converted to CO₂ and H₂O in the presence of O₂.
- redox precipitation,
- CeO₂-ZrO₂-MnO_x,
- catalytic oxidation of toluene,
- surface oxygen species,
- benzoic acid

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References(41)

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