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 CO2 due to the presence of the amino groups in the pore space.
Bibliographical noteFunding Information:
Ruud Hendrikx at the Department of Materials Science and Engineering of the Delft University of Technology is acknowledged for the X-ray analysis. J.G. gratefully acknowledges the Netherlands National Science Foundation (NWO) for his personal VENI grant. J.F.M.D. acknowledges FWO Vlaanderen for financial support.
- Metal-Organic Framework
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials