Superior Performance of Mesoporous MOF MIL-100 (Fe) Impregnated with Ionic Liquids for CO₂ Adsorption

Abstract

We present molecular simulations of gases in mesoporous MOF MIL-100(Fe) impregnated with ionic liquidsAdsorption of pure carbon dioxide, methane, nitrogen, and typical mixtures found in flue gases and natural gas are studied. Increases in CO 2 adsorption, sitting, and selectivity were investigated to provide an impregnation alternative in a stable material that could be experimentally successful. The presence of ionic liquids, in particular [Bmim + ][SCN − ], increases CO 2 uptake within the pressure range up to 2000 kPa, which is unprecedented for impregnated MOF structures. We found that the impregnation of the mesoporous MOF structure doubles CO 2 adsorbed concentration and selectivities (CO 2 /CH 4 and CO 2 /N 2 ) at ambient temperature and low pressure range (<100 kPa). These results provide evidence that IL impregnation of mesoporous MOFs may render them unique characteristics that are likely to be useful for CO 2 capture.

Tuning CO2 Binding in Metal–Organic Framework Materials by Varying Metal Identity and Oxidation State

“…Our experimental data yield an isosteric heat of adsorption of −38.1 kJ/mol for CO 2 adsorption onto MIL-100­(Fe), comparable to values ranging between −35 and −25 kJ/mol reported in the literature for F – -containing MIL-100­(Fe) materials activated between 473 and 523 K, ,, and a value of −33 to −35 kJ/mol at low CO 2 coverages measured using microcalorimetry. ,, Differences in heats of adsorption versus those in the literature for MIL-100­(Fe) may be attributable to the fluoride-free nature of the synthesis protocols reported heredifferences supported by an effect of the presence of the F – anion on CO 2 adsorption performance as reported by Oliveira et al − A lack of dissimilarity in binding properties of Fe 2+ and Fe 3+ sites has also previously been suggested by Leclerc et al, who used imperceptible changes in FTIR spectra obtained on activating samples at different temperatures, as well as identical heats of adsorption at zero coverage upon activation at 423 and 523 K to suggest similar binding properties of MIL-100 Fe 2+ and Fe 3+ sites . Along these lines, Yoon et al have reported microcalorimetry-derived heats of adsorption of CO 2 that remain relatively invariant in activation temperature, suggestive of a lack of CO 2 binding affinity differences associated with Fe 3+ and Fe 2+ sites .…”

State of the art of ionic liquid‐modified adsorbents forCO2capture and separation

“…N 2 ,61 or both[66][67][68] was also achieved in other studies. The schematic of one of these adsorbents namely [C 2 mim][SCN]@Cu-BTC was shown in Figure3and ILs were present in both pores and surface of supports.…”

Ionic Liquid Supported on Magnetic Graphene Oxide as a Highly Efficient and Stable Catalyst for the Synthesis of Triazolopyrimidines

“…Ionic liquids on supports have the advantage of combining the properties of an ionic liquid with the typical advantag-es of immobilization, such as easy recycling and improved selectivity in applications with catalytic activity. 7 Heterogenization of ionic liquids on suitable porous supports, [8][9][10] suitable magnetic nanoparticles, [11][12][13] immobilized on solid supports, either by physical coating of the ionic liquids on Al 2 O 3 , 14,15 SiO 2 16,17 and TiO 2 18,19 or by covalent bonding of the ionic liquids to the support surface, would be a feasible and attractive approach to prepare an efficient solid catalyst with superior activity and stability. 20 While reasonable reusability was observed in most cases, the dispersion of the ionic liquid on the solid support was poor, and leaching of the ionic liquid occurred, resulting in loss of activity.…”