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Adsorption and Separation of Light Gases on an Amino‐Functionalized Metal–Organic Framework: An Adsorption and In Situ XRD Study
Author(s) -
Couck Sarah,
Gobechiya Elena,
Kirschhock Christine E. A.,
SerraCrespo Pablo,
JuanAlcañiz Jana,
Martinez Joaristi Alberto,
Stavitski Eli,
Gascon Jorge,
Kapteijn Freek,
Baron Gino V.,
Denayer Joeri F. M.
Publication year - 2012
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201100378
Subject(s) - adsorption , propane , methane , chemistry , pressure swing adsorption , hydrogen , nitrogen , inert gas , metal organic framework , inorganic chemistry , gas separation , chemical engineering , analytical chemistry (journal) , organic chemistry , membrane , engineering , biochemistry
The NH 2 ‐MIL‐53(Al) metal–organic framework was studied for its use in the separation of CO 2 from CH 4 , H 2 , N 2 C 2 H 6 and C 3 H 8 mixtures. Isotherms of methane, ethane, propane, hydrogen, nitrogen, and CO 2 were measured. The atypical shape of these isotherms is attributed to the breathing properties of the material, in which a transition from a very narrow pore form to a narrow pore form and from a narrow pore form to a large pore form occurs, depending on the total pressure and the nature of the adsorbate, as demonstrated by in situ XRD patterns measured during adsorption. Apart from CO 2 , all tested gases interacted weakly with the adsorbent. As a result, they are excluded from adsorption in the narrow pore form of the material at low pressure. CO 2 interacted much more strongly and was adsorbed in significant amounts at low pressure. This gives the material excellent properties to separate CO 2 from other gases. The separation of CO 2 from methane, nitrogen, hydrogen, or a combination of these gases has been demonstrated by breakthrough experiments using pellets of NH 2 ‐MIL‐53(Al). The effect of total pressure (1–30 bar), gas composition, temperature (303–403 K) and contact time has been examined. In all cases, CO 2 was selectively adsorbed, whereas methane, nitrogen, and hydrogen nearly did not adsorb at all. Regeneration of the adsorbent by thermal treatment, inert purge gas stripping, and pressure swing has been demonstrated. The NH 2 ‐MIL‐53(Al) pellets retained their selectivity and capacity for more than two years.