Pubblicazioni

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H2S Stability of Metal-Organic Frameworks: A Computational Assessment

Pengbo Lyu, Guillaume Maurin

[The H2S stability of a range of MOFs was systematically assessed by first-principle calculations. The most likely degradation mechanism was first determined and we identified the rate constant of the degradation reaction as a reliable descriptor for …]
The H2S stability of a range of MOFs was systematically assessed by first-principle calculations. The most likely degradation mechanism was first determined and we identified the rate constant of the degradation reaction as a reliable descriptor for characterizing the H2S stability of MOFs. A qualitative H2S stability ranking was thus established for the list of investigated materials. Elemental structure-stability relationships were further envisaged considering several variables including the nature of the linkers and their grafted functional groups, the pore size, the nature of metal sites and the presence/nature of coordinatively unsaturated sites. This knowledge enabled the anticipation of the H2S stability of one prototypical MOF, e.g. MIL-91(Ti), which has been previously proposed as a good candidate for CO2 capture. This computational strategy enables an accurate and easy handling assessment of the H2S stability of MOFs and offers a solid alternative to experimental characterizations that require the manipulation of a highly toxic and corrosive molecule.

Keywords: Metal-organic frameworks, Hydrogen disulfide, Prediction of stability, Understanding of Degradation Mechanism, Density Functional Theory.

Metal-Organic Frameworks (MOFs) – Fabrication, propriétés et applications

Farid NOUAR, Georges MOUCHACHAM, Christian SERRE

[Les Metal-Organic Frameworks (MOFs) sont des solides hybrides (organique/inorganique) micro- ou méso-poreux ordonnés. L’engouement scientifique et technologique pour cette famille de composés ne cesse de croître …]
Les Metal-Organic Frameworks (MOFs) sont des solides hybrides (organique/inorganique) micro- ou méso-poreux ordonnés. L’engouement scientifique et technologique pour cette famille de composés ne cesse de croître au vu de leur grande diversité chimique et structurale, et de leurs nombreuses applications potentielles. Cet article propose un aperçu global sur les MOFs, notamment sur leurs modes de synthèses et les méthodes de caractérisations, leurs structures, leurs propriétés aisément modulables ainsi que certains exemples représentatifs d’applications potentielles. De plus, leur mise à l’échelle à moindre coût par des procédés respectueux de l’environnement, ainsi que leur mise en forme sont discutées.
Keywords: Metal-organic frameworks, Hydrogen disulfide, Prediction of stability, Understanding of Degradation Mechanism, Density Functional Theory.