Structural deterioration of well-faceted MOFs upon H2S exposure and its effect in the adsorption performance
Reljic, Snezana (Universitat d'Alacant. Departament de Química Inorgànica)
Broto-Ribas, Anna (Institut Català de Nanociència i Nanotecnologia)
Cuadrado, Carlos (Universitat d'Alacant. Departament de Química Inorgànica)
Jardim, Erika (Universitat d'Alacant. Departament de Química Inorgànica)
Maspoch Comamala, Daniel (Institut Català de Nanociència i Nanotecnologia)
Imaz, Inhar (Institut Català de Nanociència i Nanotecnologia)
Silvestre-Albero, Joaquin (Universitat d'Alacant. Departament de Química Inorgànica)

Date:	2020
Abstract:	The structural deterioration of archetypical, well-faceted metal-organic frameworks (MOFs) has been evaluated upon exposure to an acidic environment (HS). Experimental results show that the structural damage highly depends on the nature of the hybrid network (e. g. , softness of the metal ions, hydrophilic properties, among others) and the crystallographic orientation of the exposed facets. Microscopy images show that HKUST-1 with well-defined octahedral (111) facets is completely deteriorated, ZIF-8 with preferentially exposed (110) facets exhibits a large external deterioration with the development of holes or cavities in the mesoporous range, whereas UiO-66-NH with (111) exposed facets, and PCN-250 with (100) facets does not reflect any sign of surface damage. Despite the selectivity in the external deterioration, X-ray diffraction and gas adsorption measurements confirm that indeed all MOFs suffer an important internal deterioration, these effects being more severe for MOFs based on softer cations (e. g. , Cu-based HKUST-1 and Fe-based PCN-250). These structural changes have inevitable important effects in the final adsorption performance for CO and CH at low and high pressures.
Grants:	European Commission 615954 Ministerio de Economía y Competitividad RTI2018-095622-B-100 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad MAT2016-80285-p Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-238
Note:	Altres ajuts: financial support from the CERCA Program/Generalitat de Catalunya.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	MOFs ; Acid exposure ; Structural stability ; H2S ; High-pressure
Published in:	Chemistry, Vol. 26, issue 71 (Dec. 2020) , p. 17110-17119, ISSN 1521-3765

DOI: 10.1002/chem.202002473

Postprint 10 p, 900.3 KB

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