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

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

Resumen: 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

Idioma: Inglés

DOI: 10.1038/s41467-025-58426-w

Año: 2025

Publicado en: Nature communications 16, 1 (2025), 3243 [15 pp.]
ISSN: 2041-1723

Financiación: info:eu-repo/grantAgreement/ES/AEI/FJC2018-035697-I
Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2020-115658GB-I00
Financiación: info:eu-repo/grantAgreement/ES/AEI/RYC2022-036070-I
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CEX2021-001214-S
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PDC2022-133214-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-124796OB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-124880NB-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)