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<p>In this study, a series of La-α-MnO<sub>2</sub> catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO<sub>2</sub> and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn<sup>3+</sup> and O<sub>ads</sub> content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO<sub>2</sub> catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215&#xa0;°C. In addition, 1%La-α-MnO<sub>2</sub> catalyst presented good stability and repeatability during 50&#xa0;h durability test under water vapor.</p>

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Trace lanthanum-modified α-MnO2 catalyst for total oxidation of toluene by weakening the Mn–O bond

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Lijun Cheng,
  • Juan Lei,
  • Xiaoli Ren,
  • Hong Chang,
  • Baihe Ju

摘要

In this study, a series of La-α-MnO2 catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO2 and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn3+ and Oads content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO2 catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215 °C. In addition, 1%La-α-MnO2 catalyst presented good stability and repeatability during 50 h durability test under water vapor.