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<p>Direct Air Capture is a promising climate mitigation technology, but its deployment is limited by high energy demand. This study improves the energy efficiency and sustainability of liquid-based Direct Air Capture by integrating catalytic solvent regeneration and hybrid solvents with a low-temperature membrane vacuum regeneration process. Iron-sulfated zirconia catalysts supported on alumina and silica are synthesized and evaluated, with silica exhibiting superior catalytic performance. An optimal iron-sulfated zirconia to silica ratio of 1:1 reduces relative heat duty by up to 59.7% in the membrane vacuum system. To assess the impact of hybrid solvents on energy consumption, a solvent composed of 3 molar potassium taurinate and 1 molar potassium sarcosinate achieves a 69.1% improvement in CO<sub>2</sub> desorption compared to potassium taurinate alone. Finally, combining the optimized hybrid solvent, catalyst, and membrane system at 90 °C reduces thermal energy consumption by 66.8% relative to potassium glycinate, achieving an energy requirement of 2.6 GJ/tCO<sub>2</sub>.</p>

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Catalytic hybrid solvent regeneration in membrane vacuum processes for direct air capture

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月14日

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  • Arash Momeni,
  • Hossein Anisi,
  • Rebecca V. McQuillan,
  • Masood S. Alivand,
  • Ali Zavabeti,
  • Saeed Askari,
  • Rui Zhang,
  • Geoffrey W. Stevens,
  • Kathryn A. Mumford

摘要

Direct Air Capture is a promising climate mitigation technology, but its deployment is limited by high energy demand. This study improves the energy efficiency and sustainability of liquid-based Direct Air Capture by integrating catalytic solvent regeneration and hybrid solvents with a low-temperature membrane vacuum regeneration process. Iron-sulfated zirconia catalysts supported on alumina and silica are synthesized and evaluated, with silica exhibiting superior catalytic performance. An optimal iron-sulfated zirconia to silica ratio of 1:1 reduces relative heat duty by up to 59.7% in the membrane vacuum system. To assess the impact of hybrid solvents on energy consumption, a solvent composed of 3 molar potassium taurinate and 1 molar potassium sarcosinate achieves a 69.1% improvement in CO2 desorption compared to potassium taurinate alone. Finally, combining the optimized hybrid solvent, catalyst, and membrane system at 90 °C reduces thermal energy consumption by 66.8% relative to potassium glycinate, achieving an energy requirement of 2.6 GJ/tCO2.