Abstract
Carbon dioxide gas adsorption in amino-functionalized MIL-53(Al) at various temperatures has been analysed in combination with temperature programmed XRD. Similarly to the regular MIL-53(Al) material, the so-called breathing phenomenon was shown to take place in the amino-MIL-53 upon adsorption of different molecules, i.e. the transition between a large-pore ( lp) and a narrow-pore ( np) structure. Using the osmotic thermodynamic model analysis, the temperature–loading phase diagram was derived. The overall diagram is similar to that for the regular MIL-53(Al), but a spectacular difference is the much larger stability domain of the np structure, which can be accounted for by the increased affinity for CO 2 due to the presence of the amino groups in the pore space.
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