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<p>Removing trace acetylene from ethylene streams is critical to protect Ziegler–Natta polymerization. Eggshell Pd–Ag/θ-Al<sub>2</sub>O<sub>3</sub> spheres (0.03&#xa0;wt% Pd, 0.13&#xa0;wt% Ag) were promoted with 1&#xa0;wt% alkaline-earth additives to suppress green oil and improve ethylene selectivity. XRD, N<sub>2</sub> physisorption, H<sub>2</sub>-TPR, NH<sub>3</sub>/CO<sub>2</sub>-TPD, TPO, SEM–EDS, and ICP-OES established structure-property links. Fixed-bed tests (10&#xa0;bar, 40–60&#xa0;°C) after H<sub>2</sub> prereduction showed promoter-stabilized θ-Al<sub>2</sub>O<sub>3</sub>, higher surface area and mesoporosity and stronger metal-support interactions. All promoted catalysts achieved ≳ 96% acetylene conversion with higher ethylene selectivity and reduced carbon deposition. A possible contribution from hydrogen spillover is discussed qualitatively based on indirect evidence.</p>

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Alkaline-earth-promoted Pd–Ag/Al2O3 for selective acetylene hydrogenation: green-oil mitigation, ethylene selectivity, and implications for hydrogen spillover

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月13日

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  • Farnaz Rahbar Shamskar,
  • Sajad Mobini,
  • Mehran Rezaei

摘要

Removing trace acetylene from ethylene streams is critical to protect Ziegler–Natta polymerization. Eggshell Pd–Ag/θ-Al2O3 spheres (0.03 wt% Pd, 0.13 wt% Ag) were promoted with 1 wt% alkaline-earth additives to suppress green oil and improve ethylene selectivity. XRD, N2 physisorption, H2-TPR, NH3/CO2-TPD, TPO, SEM–EDS, and ICP-OES established structure-property links. Fixed-bed tests (10 bar, 40–60 °C) after H2 prereduction showed promoter-stabilized θ-Al2O3, higher surface area and mesoporosity and stronger metal-support interactions. All promoted catalysts achieved ≳ 96% acetylene conversion with higher ethylene selectivity and reduced carbon deposition. A possible contribution from hydrogen spillover is discussed qualitatively based on indirect evidence.