Effect of Adsorbent History on Adsorption Characteristics
of MIL-53(Al) Metal Organic
Framework
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Abstract
Structural transformation of MIL-53(Al)
metal organic framework
from large pore to narrow pore form (lp → np) or vice versa
is known to occur by adsorption of certain guest molecules, by temperature
change or by applying mechanical pressure. In this work, we perform
a systematic investigation to demonstrate that adsorbent history also
plays a decisive role in the structural transitions of this material
(and hence on its adsorption characteristics). By changing the adsorbent
history, parent MIL-53(Al) is tuned into its np domain at ambient
temperature such that it not only exhibits a significant increase
in CO<sub>2</sub> capacity, but also shows negligible uptake for CH<sub>4</sub>, N<sub>2</sub>, CO, and O<sub>2</sub> at subatmospheric pressure.
In addition, for the high pressure region (1–8 bar), we propose
a method to retain the lp form of the sample to enhance its CO<sub>2</sub> uptake