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<p>The effect of the crystalline phase of&#xa0;manganese dioxide on aqueous-phase hydrodgenation of phenol over MnO<sub>2</sub>-supported Ru catalysts was examined. Various Ru catalysts supported on different manganese dioxide (α-MnO<sub>2</sub>, δ-MnO<sub>2</sub>, and γ-MnO<sub>2</sub>) were prepared using a wet impregnation method. The prepared catalysts were characterized using X-ray diffraction (XRD), Transmission electron microscope (TEM), hydrogen temperature-programmed reduction (H<sub>2</sub>-TPR), and X-ray photoelectron spectroscopy (XPS). Among these catalysts, Ru/δ-MnO<sub>2</sub> exhibited superior catalytic activity with complete phenol conversion and cyclohexanol selectivity. The characterization analysis revealed that δ-MnO<sub>2</sub> exhibited the highest oxygen vacancy (O<sub>V</sub>) concentration (33%) among the studied phases. This elevated O<sub>V</sub> content significantly promoted water molecule adsorption, thereby facilitating proton transfer across the MnO<sub>2</sub> surface and consequently improving hydrogenation performance. The study establishes a clear quantitative correlation between MnO<sub>2</sub> crystal structures and oxygen-mediated metal-support interactions, offering valuable insights for designing efficient hydrogenation catalysts applicable to both bio-oil refinement and wastewater purification processes.</p>

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Aqueous-phase hydrogenation of phenol over Ru catalysts supported on manganese dioxide with different crystalline phases

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Zihao Tong,
  • Fei Wang,
  • Yingjie Yuan,
  • Yilong Yang,
  • Yunfei Xiong,
  • Xuejiao Wei,
  • Yinwen Gu,
  • Jie Xu,
  • Bing Xue

摘要

The effect of the crystalline phase of manganese dioxide on aqueous-phase hydrodgenation of phenol over MnO2-supported Ru catalysts was examined. Various Ru catalysts supported on different manganese dioxide (α-MnO2, δ-MnO2, and γ-MnO2) were prepared using a wet impregnation method. The prepared catalysts were characterized using X-ray diffraction (XRD), Transmission electron microscope (TEM), hydrogen temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). Among these catalysts, Ru/δ-MnO2 exhibited superior catalytic activity with complete phenol conversion and cyclohexanol selectivity. The characterization analysis revealed that δ-MnO2 exhibited the highest oxygen vacancy (OV) concentration (33%) among the studied phases. This elevated OV content significantly promoted water molecule adsorption, thereby facilitating proton transfer across the MnO2 surface and consequently improving hydrogenation performance. The study establishes a clear quantitative correlation between MnO2 crystal structures and oxygen-mediated metal-support interactions, offering valuable insights for designing efficient hydrogenation catalysts applicable to both bio-oil refinement and wastewater purification processes.