How Hydration Drastically Improves Adsorption Selectivity for CO2 over CH4 in the Flexible Chromium Terephthalate MIL‐53

Taking a deep breath: The hydrated form of the microporous metal organic framework MIL-53(Cr) performs better than the dehydrated form for the selectivity binding of carbon dioxide over methane (see graph). The polarity of the adsorbed gas is thought to play a role in inducing framework flexibility and the breathing of the pores.