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Effect of NH2 and CF3 functionalization on the hydrogen sorption properties of MOFs

2011; Royal Society of Chemistry; Volume: 40; Issue: 18 Linguagem: Inglês

10.1039/c1dt10115c

1477-9234

Claudia Zlotea, Delphine Phanon, Matjaž Mazaj, Daniela Heurtaux, Vincent Guillerm, Christian Serre, Patricia Horcajada, Thomas Devic, Emmanuel Magnier, Fermín Cuevas, Gérard Férey, Philip L. Llewellyn, M. Latroche,

Hydrogen Storage and Materials

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.