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<p>Post synthetic modification of metal organic frameworks presents a viable route for amine functionalization which can significantly enhance CO<sub>2</sub> sorption capacity. We present a facile means of amine incorporation using limited synthetic steps and low-cost reagents that results in a high density of primary alkyl amines distributed through a zirconium-based metal organic framework (MOF). Both the MOF synthesis and the post synthetic modification take place under aqueous conditions and result in strongly bound molecular amines available for sorbate interaction throughout the MOF pores. This amine incorporation protocol results in a significantly increased CO<sub>2</sub> capacity compared with the unmodified MOF-808. Specifically, CO<sub>2</sub> isotherms collected at 298&#xa0;K for the unmodified MOF-808 show uptakes of 0.06, 0.2, and 1.2 mmol/g at 4, 15, and 100&#xa0;kPa, respectively, which can be compared with 0.3, 0.7, and 2.5 mmol/g for the glycine grafted MOF-808 and 0.5, 0.9, and 2.3 mmol/g for ethylenediamine grafted MOF-808.</p>

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Post synthetic amine functionalization of MOF-808 for CO2 sorption via ligand exchange and Michael addition

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Patrick F. Muldoon,
  • Samir Budhathoki,
  • Ali K. Sekizkardes,
  • Zoe M. Soilis,
  • Nathaniel L. Rosi,
  • Dan C. Sorescu,
  • Janice A. Steckel

摘要

Post synthetic modification of metal organic frameworks presents a viable route for amine functionalization which can significantly enhance CO2 sorption capacity. We present a facile means of amine incorporation using limited synthetic steps and low-cost reagents that results in a high density of primary alkyl amines distributed through a zirconium-based metal organic framework (MOF). Both the MOF synthesis and the post synthetic modification take place under aqueous conditions and result in strongly bound molecular amines available for sorbate interaction throughout the MOF pores. This amine incorporation protocol results in a significantly increased CO2 capacity compared with the unmodified MOF-808. Specifically, CO2 isotherms collected at 298 K for the unmodified MOF-808 show uptakes of 0.06, 0.2, and 1.2 mmol/g at 4, 15, and 100 kPa, respectively, which can be compared with 0.3, 0.7, and 2.5 mmol/g for the glycine grafted MOF-808 and 0.5, 0.9, and 2.3 mmol/g for ethylenediamine grafted MOF-808.