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<p>In this study, an efficient and low-cost water-washing method is demonstrated for regenerating sulfur-poisoned <i>α</i>-MnO<sub>2</sub> and Pt/<i>α</i>-MnO<sub>2</sub> samples from benzene oxidation. Following sulfur poisoning, the temperature at which 90% conversion was achieved (<i>T</i><sub>90%</sub>) for the benzene oxidation process deteriorated to 307&#xa0;°C for the <i>α</i>-MnO<sub>2</sub>-S sample and 260&#xa0;°C for the Pt/<i>α</i>-MnO<sub>2</sub>-S sample. Surprisingly, simple water washing successfully restored catalytic activity, reducing the <i>T</i><sub>90%</sub> of the regenerated samples (<i>α</i>-MnO<sub>2</sub>-W and Pt/<i>α</i>-MnO<sub>2</sub>-W) by 54&#xa0;°C and 52&#xa0;°C to 361&#xa0;°C and 208&#xa0;°C. The regenerated catalysts exhibited performance nearly identical to fresh catalysts, with <i>T</i><sub>90%</sub> differences below 10&#xa0;°C. Fourier Transform Infrared (FTIR) spectroscopy confirmed the novelty and mechanism of this strategy: the sulfate vibration band at 1145&#xa0;cm<sup>−1</sup> completely disappeared post-washing, directly linking activity recovery to the removal of surface sulfate species and the regeneration of active sites. The effects of water washing on sample activity were investigated using systems including BET, SEM, H<sub>2</sub>-TPR and XPS. The results indicate that the washed samples exhibit superior low-temperature reduction performance and a higher Mn<sup>3+</sup>/Mn<sup>4+</sup> molar ratio. This study establishes water washing as a straightforward and highly effective method for achieving complete regeneration of sulfur-poisoned manganese-based catalysts, offering a highly promising strategy for the recycling of industrial catalysts.</p> Graphical abstract <p></p>

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High-efficiency regeneration of α-MnO2 samples from sulfur poisoning in benzene catalytic oxidation by water washing

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Wenjin Wang,
  • Dan Zhang,
  • Huan Liu,
  • Chao Qu,
  • Xuelong Zheng,
  • Jingjing Zhang,
  • Qing Ye

摘要

In this study, an efficient and low-cost water-washing method is demonstrated for regenerating sulfur-poisoned α-MnO2 and Pt/α-MnO2 samples from benzene oxidation. Following sulfur poisoning, the temperature at which 90% conversion was achieved (T90%) for the benzene oxidation process deteriorated to 307 °C for the α-MnO2-S sample and 260 °C for the Pt/α-MnO2-S sample. Surprisingly, simple water washing successfully restored catalytic activity, reducing the T90% of the regenerated samples (α-MnO2-W and Pt/α-MnO2-W) by 54 °C and 52 °C to 361 °C and 208 °C. The regenerated catalysts exhibited performance nearly identical to fresh catalysts, with T90% differences below 10 °C. Fourier Transform Infrared (FTIR) spectroscopy confirmed the novelty and mechanism of this strategy: the sulfate vibration band at 1145 cm−1 completely disappeared post-washing, directly linking activity recovery to the removal of surface sulfate species and the regeneration of active sites. The effects of water washing on sample activity were investigated using systems including BET, SEM, H2-TPR and XPS. The results indicate that the washed samples exhibit superior low-temperature reduction performance and a higher Mn3+/Mn4+ molar ratio. This study establishes water washing as a straightforward and highly effective method for achieving complete regeneration of sulfur-poisoned manganese-based catalysts, offering a highly promising strategy for the recycling of industrial catalysts.

Graphical abstract