Effect of NH2 and CF3 functionalization on the hydrogen sorption properties of MOFs
Claudia Zlotea(Centre National de la Recherche Scientifique), Delphine Phanon(Centre National de la Recherche Scientifique), Matjaž Mazaj(Centre National de la Recherche Scientifique), Daniela Heurtaux(Centre National de la Recherche Scientifique), Vincent Guillerm(Centre National de la Recherche Scientifique), Christian Serre(Institut Lavoisier de Versailles), Patricia Horcajada(Centre National de la Recherche Scientifique), Thomas Devic(Institut Lavoisier de Versailles), Emmanuel Magnier(Institut Lavoisier de Versailles), Fermín Cuevas(Centre National de la Recherche Scientifique), Gérard Férey(Institut Lavoisier de Versailles), Philip L. Llewellyn(Centre National de la Recherche Scientifique), M. Latroche(Institut de Chimie et des Matériaux Paris-Est)
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Abstract
The hydrogen adsorption capacity and heat of adsorption at 77 K have been evaluated for several porous metal terephthalate MOFs (MIL-53(Fe), MIL-125(Ti) and UiO-66(Zr)), as well as in their -NH(2) and -(CF(3))(2) functionalized isoreticular structures. The capacity of hydrogen is basically related to the textural properties of the solids and not to their composition. The heats of adsorption at low coverage are on the whole close to those usually reported for MOFs (6-7 kJ mol(-1)), except for the UiO-66(Zr) and MIL-53(Fe)-(CF(3))(2) analogues, whereas the presence of Lewis acid sites and/or a confinement effect enhances significantly the strength of interaction with hydrogen.
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