Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Hydrogen in Materials: Hydrogen Storage
MM 17.2: Talk
Tuesday, September 6, 2022, 14:15–14:30, H46
Metal-organic frameworks for hydrogen isotope separation — •Michael Hirscher — Max-Planck-Institut für Intelligent Systeme, Stuttgart, Germany
One of the important operations in chemical industry is separation and purification of gaseous products. Especially H2/D2 isotope separation is a difficult task since its size, shape and thermodynamic properties resemble each other. Porous materials offer two different mechanisms for separating hydrogen isotopes, either confinement in small pores, i.e., kinetic quantum sieving, or adsorption on strong binding sites, i.e., chemical affinity quantum sieving. The new class of metal-organic frameworks (MOFs) allows the exact tailoring of pore size and aperture as well as including open metal sites into the framework. Furthermore, if MOFs consist not of a static, but flexible framework, they can reversibly respond to external stimuli, which may even enhance the separation selectivity.
Experimentally, the measurement of the selectivity for hydrogen isotope separation is very challenging, since it requires low temperatures near the boiling point of the gases. Using low-temperature thermal desorption spectroscopy (TDS), we have developed a method for measuring directly the isotope selectivity after exposure to H2/D2 mixtures.
Exemplarily, this talk will present experimental results on hydrogen isotope separation in MOFs.