CO₂ capture enhancement in InOF-1 via the bottleneck effect of confined ethanol

Abstract

CO2 capture of InOF-1 was enhanced 3.6-fold, at 1 bar and 30 °C, by confining EtOH within its pores. Direct visualisation by single crystal X-ray diffraction revealed that EtOH divides InOF-1 channels in wide sections separated by "bottlenecks" caused by EtOH molecules bonded to the μ2-OH functional groups of InOF-1.

Bottleneck Effect Explained by Le Bail Refinements: Structure Transformation of Mg-CUK-1 by Confining H2O Molecules

“…When there is one hydrogen-bonded H 2 O molecule per unit cell, the pore-window is reduced to approximately 4.43 Å and the distance between two water molecules increases to 20.5 Å (Table 1). This can provide enough free space for the CO 2 molecules to diffuse within the pore-window and, as we previously reported, a "bottleneck effect" occurs [16,17]. This effect is expected to accommodate the CO 2 molecules more efficiently, by partially obstructing the pore-windows of Mg-CUK-1.…”

Water Adsorption Properties of NOTT-401 and CO2 Capture under Humid Conditions

“…Our hypothesis is that the amount of adsorbed H 2 O is unchanged after the dosing of H 2 O/CO 2 mixed gas as we previously reported. 19 In the final part of the experiment, from 90 to 120 min , the maximum amount of CO 2 captured was 3.9 wt % (contemplating the 1.0 wt % corresponding to the water uptake). Additionally, after this CO 2 capture experiment at 5% RH, a PXRD experiment was carried out to evaluate the retention of the crystallinity of NOTT-401, which can lead to the assessment of the sorbent regeneration.…”

“…Thus, when “small” amounts of CO 2 enter into the pores of NOTT-401, there is nothing to displace (N 2 molecules), and therefore the total uptake is expected to be much higher than under dynamic conditions, as previously reported. 19,19e Nevertheless, the central target of this study is to come closer to a more lifelike CO 2 capture state (constant CO 2 flow) and analyze the effect of small amounts of water on the overall CO 2 capture.…”

Harnessing Shape Complementarity for Upgraded Cyclohexane Purification through Adaptive Bottlenecked Pores in an Imidazole‐Containing MOF

“…A close examination reveals the empty space in the channels is shaped into 1‐periodic bottlenecks (Figure 1 a, bottom), [35–39] unlike common pillared‐square‐grid pores [40] . The pore segment has a diameter of 13.0 Å while the neck narrows down to 6.38 Å in width.…”