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<p>The removal of SO<sub>2</sub> from flue gas remains a challenge. Adsorption-based separation of SO<sub>2</sub> using porous materials has been proposed as a more energy-efficient and cost-effective alternative to more traditional methods such as cryogenic distillations. Here we report a flexible hydrogen-bonded organic framework (HOF-NKU-1) that enables the sieving of SO<sub>2</sub> through the guest-adaptive response and shape-memory effect of the material. HOF-NKU-1 exhibits a high selectivity of 7,331 for the separation of SO<sub>2</sub>/CO<sub>2</sub> and a high SO<sub>2</sub> storage density of 3.27 g cm<sup>−3</sup> within the pore space at ambient conditions. The hydrophobic nature of HOF-NKU-1 enables high dynamic SO<sub>2</sub> uptake and SO<sub>2</sub> recovery, even in conditions of 95% humidity. The SO<sub>2</sub>/CO<sub>2</sub> separation mechanism is studied through combinatorial gas sorption isotherms, breakthrough experiments and single-crystal diffraction studies, paving the way for the development of multifunctional shape-memory porous materials in the future.</p><p></p>

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Flue gas desulfurization and SO2 recovery within a flexible hydrogen-bonded organic framework

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Lin Li,
  • Xuan Zhang,
  • Xin Lian,
  • Laiyu Zhang,
  • Zhiyuan Zhang,
  • Xiongli Liu,
  • Tengfei He,
  • Baiyan Li,
  • Banglin Chen,
  • Xian-He Bu

摘要

The removal of SO2 from flue gas remains a challenge. Adsorption-based separation of SO2 using porous materials has been proposed as a more energy-efficient and cost-effective alternative to more traditional methods such as cryogenic distillations. Here we report a flexible hydrogen-bonded organic framework (HOF-NKU-1) that enables the sieving of SO2 through the guest-adaptive response and shape-memory effect of the material. HOF-NKU-1 exhibits a high selectivity of 7,331 for the separation of SO2/CO2 and a high SO2 storage density of 3.27 g cm−3 within the pore space at ambient conditions. The hydrophobic nature of HOF-NKU-1 enables high dynamic SO2 uptake and SO2 recovery, even in conditions of 95% humidity. The SO2/CO2 separation mechanism is studied through combinatorial gas sorption isotherms, breakthrough experiments and single-crystal diffraction studies, paving the way for the development of multifunctional shape-memory porous materials in the future.