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<p>To enhance the UV transmittance of coal-derived ethylene glycol affected by unsaturated impurities, we designed Cu–Ni/γ-Al<sub>2</sub>O<sub>3</sub> catalysts by precisely adjusting the Cu/Ni ratios to regulate Brønsted/Lewis acid distribution on γ-Al<sub>2</sub>O<sub>3</sub> supports. Systematic characterization (XRD, H<sub>2</sub>-TPR, and NH<sub>3</sub>-TPD) revealed that the 1.6Cu18Ni/γ-Al<sub>2</sub>O<sub>3</sub> catalyst possesses a uniform mesoporous structure (10&#xa0;nm pore size, 95 m<sup>2</sup> g<sup>−1</sup> surface area) and an optimal Brønsted-to-Lewis acid ratio (0.23). This unique acidity conferred exceptional liquid-phase hydrogenation activity for unsaturated compounds, achieving UV transmittance improvements from 29%/42%/94% to 75%/92%/99% at 220/275/350 nm, meeting polyester-grade specifications. Mechanistic studies indicate that moderate Brønsted acidity selectively activates C=O/C=C bonds, while the synergistic effect of the Cu–Ni alloy can improve the hydrogenation kinetics of the single-metal system. This work establishes a design paradigm for high-efficiency catalysts through acid site engineering on support surfaces.</p> Graphical Abstract <p></p>

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Synergistic Cu–Ni Bimetallic Catalysis on γ-Al2O3: Tuning Brønsted/Lewis Acid Sites for Efficient Hydrogenation in Coal-Derived Ethylene Glycol

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Wei Wei,
  • Yaowen Zhang,
  • Haoyu Jiang,
  • Haiji Hua,
  • Jinhai Li,
  • BaoYue Zheng,
  • Yong Jin,
  • Chao Xu,
  • Yuxuan Xu,
  • Huidan Lu,
  • Yongping Liu

摘要

To enhance the UV transmittance of coal-derived ethylene glycol affected by unsaturated impurities, we designed Cu–Ni/γ-Al2O3 catalysts by precisely adjusting the Cu/Ni ratios to regulate Brønsted/Lewis acid distribution on γ-Al2O3 supports. Systematic characterization (XRD, H2-TPR, and NH3-TPD) revealed that the 1.6Cu18Ni/γ-Al2O3 catalyst possesses a uniform mesoporous structure (10 nm pore size, 95 m2 g−1 surface area) and an optimal Brønsted-to-Lewis acid ratio (0.23). This unique acidity conferred exceptional liquid-phase hydrogenation activity for unsaturated compounds, achieving UV transmittance improvements from 29%/42%/94% to 75%/92%/99% at 220/275/350 nm, meeting polyester-grade specifications. Mechanistic studies indicate that moderate Brønsted acidity selectively activates C=O/C=C bonds, while the synergistic effect of the Cu–Ni alloy can improve the hydrogenation kinetics of the single-metal system. This work establishes a design paradigm for high-efficiency catalysts through acid site engineering on support surfaces.

Graphical Abstract