Structurally dynamic metal organic frameworks (MOFs) are an exciting class of sorbents whose porosity can change in response to gas adsorption, temperature, or other stimuli. The ability to selectively control this dynamic structure would create unique advantages to engineer sorbents for a variety of separation applications. In this regard, the mechanisms and energetics associated with dynamic pores, as well as the simple interactions of gases are still not well characterized. In situ infrared spectroscopy, small angle neutron scattering, and other methods have been used to probe the structural changes occurring in several dynamic MOFs during the adsorption of pure gases and mixtures at pressures up to ~40 atm. Gas selectivity has been quantified using breakthrough curve measurements and equilibrium batch reactor studies. Collectively these techniques have provided new physical insight into how conformational rearrangements of ligands, adsorption sites, and guest-induced structural changes impact selectivity.

Structurally dynamic metal organic frameworks for light gas separations

245th National Meeting (2013)

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