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<p>A flower-like core–shell MnO<sub>2</sub>@CeO<sub>2</sub> composite was synthesized via hydrothermal method. Characterization by X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy confirmed a micro-spherical morphology with a high specific surface area (266.4 m<sup>2</sup>&#xa0;g<sup>−1</sup>) and well-defined mesoporous structure (average pore size: 7.4 nm), facilitating active site exposure and reactant adsorption. Under optimal conditions (25 mg catalyst, 1.5 mL 25 wt% peroxymonosulfate, 2 mL acetonitrile, 600 ppm initial sulfur, 40℃), the desulfurization efficiency for dibenzothiophene reached 81.26%. It maintained 71% efficiency after 5 cycles, with stable chemical structure and morphology. Quenching experiments confirm that the primary oxidation of dibenzothiophene to dibenzothiophene sulfoxide is predominantly mediated by sulfate radicals (·SO<sub>4</sub>⁻), while the subsequent oxidation of dibenzothiophene sulfoxide to dibenzothiophene sulfone relies primarily on hydroxyl radicals (·OH). Kinetic analysis showed tandem reaction behavior with rate constants k<sub>1</sub> = 0.213 min⁻<sup>1</sup> and k<sub>2</sub> = 0.187 min⁻<sup>1</sup>. This catalyst offers promising potential for industrial production of ultra-low-sulfur fuels.</p> Graphical Abstract <p></p>

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Preparation of flower-like microspheres MnO2@CeO2 catalyst for desulfurization at room temperature

  • 期刊论文

  • 发表日期：

    2026年3月8日

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  • Chaojie Hou,
  • Hang Xu,
  • Bingbing Zhang,
  • Yuan Zhao,
  • Fengmin Wu

摘要

A flower-like core–shell MnO2@CeO2 composite was synthesized via hydrothermal method. Characterization by X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy confirmed a micro-spherical morphology with a high specific surface area (266.4 m2 g−1) and well-defined mesoporous structure (average pore size: 7.4 nm), facilitating active site exposure and reactant adsorption. Under optimal conditions (25 mg catalyst, 1.5 mL 25 wt% peroxymonosulfate, 2 mL acetonitrile, 600 ppm initial sulfur, 40℃), the desulfurization efficiency for dibenzothiophene reached 81.26%. It maintained 71% efficiency after 5 cycles, with stable chemical structure and morphology. Quenching experiments confirm that the primary oxidation of dibenzothiophene to dibenzothiophene sulfoxide is predominantly mediated by sulfate radicals (·SO4⁻), while the subsequent oxidation of dibenzothiophene sulfoxide to dibenzothiophene sulfone relies primarily on hydroxyl radicals (·OH). Kinetic analysis showed tandem reaction behavior with rate constants k1 = 0.213 min⁻1 and k2 = 0.187 min⁻1. This catalyst offers promising potential for industrial production of ultra-low-sulfur fuels.

Graphical Abstract