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<p>TAMOF-1 is a robust, highly porous metal–organic framework built from Cu<sup>2+</sup> centers linked by a <i>L</i>-histidine derivative. Thanks to its high porosity and homochirality, TAMOF-1 has shown interesting molecular recognition properties, being able to resolve racemic mixtures of small organic molecules in gas and liquid phases. Now, we have discovered that TAMOF-1 also offers a competitive performance as solid adsorbent for CO<sub>2</sub> physisorption, offering promising CO<sub>2</sub> adsorption capacity ( &gt; 3.8 mmol g<sup>–1</sup>) and CO<sub>2</sub>/CH<sub>4</sub> Ideal Adsorbed Solution Theory (IAST) selectivity ( &gt; 40) at ambient conditions. Moreover, the material exhibits favorable adsorption kinetics under dynamic conditions, demonstrating good stability in high-humidity environments and minimal degradation in strongly acidic media. We have identified the key interactions of CO<sub>2</sub> within the TAMOF-1 framework by a combination of structural (neutron diffraction), spectroscopic and theoretical analyses which conclude a dual-site adsorption mechanism with the majority of adsorbed CO<sub>2</sub> molecules occupying the empty voids in the TAMOF-1 channels without strong, directional supramolecular interactions. This very weak dominant binding opens the possibility of a&#xa0;low energy regeneration process for convenient CO<sub>2</sub> purification. These features identify TAMOF-1 as a viable solid-state adsorbent for the realization of affordable biogas upgrading.</p>

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Selective adsorption of CO2 in TAMOF-1 for the separation of CO2/CH4 gas mixtures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月4日

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  • Santiago Capelo-Avilés,
  • Mabel de Fez-Febré,
  • Salvador R. G. Balestra,
  • Juanjo Cabezas-Giménez,
  • Raiana Tomazini de Oliveira,
  • Irene I. Gallo Stampino,
  • Anton Vidal-Ferran,
  • Jesús González-Cobos,
  • Vanesa Lillo,
  • Oscar Fabelo,
  • Eduardo C. Escudero-Adán,
  • Larry R. Falvello,
  • José B. Parra,
  • Paolo Rumori,
  • Gemma Turnes Palomino,
  • Carlos Palomino Cabello,
  • Stefano Giancola,
  • Sofia Calero,
  • José Ramón Galán-Mascarós

摘要

TAMOF-1 is a robust, highly porous metal–organic framework built from Cu2+ centers linked by a L-histidine derivative. Thanks to its high porosity and homochirality, TAMOF-1 has shown interesting molecular recognition properties, being able to resolve racemic mixtures of small organic molecules in gas and liquid phases. Now, we have discovered that TAMOF-1 also offers a competitive performance as solid adsorbent for CO2 physisorption, offering promising CO2 adsorption capacity ( > 3.8 mmol g–1) and CO2/CH4 Ideal Adsorbed Solution Theory (IAST) selectivity ( > 40) at ambient conditions. Moreover, the material exhibits favorable adsorption kinetics under dynamic conditions, demonstrating good stability in high-humidity environments and minimal degradation in strongly acidic media. We have identified the key interactions of CO2 within the TAMOF-1 framework by a combination of structural (neutron diffraction), spectroscopic and theoretical analyses which conclude a dual-site adsorption mechanism with the majority of adsorbed CO2 molecules occupying the empty voids in the TAMOF-1 channels without strong, directional supramolecular interactions. This very weak dominant binding opens the possibility of a low energy regeneration process for convenient CO2 purification. These features identify TAMOF-1 as a viable solid-state adsorbent for the realization of affordable biogas upgrading.