Enhancement of CO2/N2 selectivity and CO2 uptake by tuning concentration and chemical structure of imidazolium-based ILs immobilized in mesoporous silica
“…This sample with a higher DIL content was synthesized to improve the signal related to IL and confirm the immobilization of DIL. A reduction in Q 2 and Q 3 bands and the appearance of T 1 and T 3 bands (bands at −48 ppm and −68 ppm attributed to [R–Si (OSi) (OH) 2 ] (T 1 ) and [R–Si (OSi) 3 ] (T 3 ) suggest that DIL has reacted with the hydroxyl groups of the SBA-15 and formed a covalent bond with the mesoporous material [ 56 ]. Fig.…”
“…This sample with a higher DIL content was synthesized to improve the signal related to IL and confirm the immobilization of DIL. A reduction in Q 2 and Q 3 bands and the appearance of T 1 and T 3 bands (bands at −48 ppm and −68 ppm attributed to [R–Si (OSi) (OH) 2 ] (T 1 ) and [R–Si (OSi) 3 ] (T 3 ) suggest that DIL has reacted with the hydroxyl groups of the SBA-15 and formed a covalent bond with the mesoporous material [ 56 ]. Fig.…”
“…Supported ionic liquid has gradually gained popularity in recent research. 29−32 Different types of porous materials, including polymers, 33,34 silica, 35,36 activated carbon, 37,38 zeolite molecular sieves, 39,40 and metal−organic skeletons, 41,42 are frequently used to load ionic liquids. These carriers are also typically characterized by rich pore structure, high specific surface area, and good stability.…”
Section: ■ Introductionmentioning
confidence: 99%
“…Combining ionic liquids with organic or inorganic porous materials by physical or chemical methods to form supported ionic liquid materials as CO 2 adsorbents, which share the benefits of both ionic liquids and porous materials, can not only improve the selective separation effect but also successfully avoid the high viscosity caused by the direct absorption of CO 2 by ionic liquids and improve the CO 2 adsorption efficiency. Supported ionic liquid has gradually gained popularity in recent research. − Different types of porous materials, including polymers, , silica, , activated carbon, , zeolite molecular sieves, , and metal–organic skeletons, , are frequently used to load ionic liquids. These carriers are also typically characterized by rich pore structure, high specific surface area, and good stability…”
A decrease in CO 2 emissions is urgently required in the present situation due to the fast growth of carbon dioxide (CO 2 ) in the atmosphere, which has caused a series of global climate issues. This study used an impregnation−evaporation method to immobilize an amino functionalized ionic liquid [C 2 OHmim][Lys] on a chromatographic column filler GDX-103 and create a novel supported ionic liquid. The results showed that the supported ionic liquid with 60 wt % ionic liquid content had the best adsorption performance at 40 °C, and the CO 2 adsorption isotherm showed that the adsorption capacity at 0.1 MPa was 1.29 mmol CO 2 /g sorbent, which was 6 times greater than the adsorption capacity of the pure carrier. The sample with 60% ionic liquid content has an adsorption capacity of 1.02 mmol CO 2 /g sorbent under the condition of CO 2 /N 2 mixed gas with 10% CO 2 content. This is 43 times greater than the adsorption capacity of the pure carrier, and its adsorption performance is stable after three adsorption and desorption cycles. Through the rich porous structure of GDX-103, the ionic liquid is effectively supported and dispersed, which expands the contact area between CO 2 and ionic liquid and enhances the mass transfer of CO 2 . At the same time, CO 2 can be chemically bound to the groups on the anion of ionic liquid and be immobilized, so it has a high selective adsorption capacity of CO 2 , which makes it a great alternative to traditional CO 2 adsorbents.
“…32 Imidazolium-based ILs with different cation alkyl chains and inorganic anions immobilized on mesoporous silica provided a new possibility to be used in CO 2 capture. 33 Molecular dynamics simulations were used to interpret carbon dioxide's solvation and show how carbon dioxide is solvated. Molecular simulations could reproduce the experimental solubility of CO 2 and conclude higher solubility.…”
Section: ■ Introductionmentioning
confidence: 99%
“…Aprotic heterocyclic anions and phosphonium-based cations were used as potential absorbents for CO 2 capture from flue gas . Imidazolium-based ILs with different cation alkyl chains and inorganic anions immobilized on mesoporous silica provided a new possibility to be used in CO 2 capture . Molecular dynamics simulations were used to interpret carbon dioxide’s solvation and show how carbon dioxide is solvated.…”
Crystallization of ionic liquids (ILs) is essential for determining the crystal structure and molecular interactions between cations and anions; however, studies on crystallization of viscous ILs are scarce. This study investigates the network formation and intermolecular interactions present in the ILs to understand and enhance their CO 2 absorption capability. In this context, five 1,1,3,3-tetramethylguanidine [TMG]-based ILs, with odd and even anionic dicarboxylic acids such as, succinate [Suc], glutarate [Glu], adipate [Adp], pimelate [Pim], and suberate [Sub], were synthesized. The in-situ cryocrystallization technique was used to determine the structure of two viscous ILs, [TMG][Glu] and [TMG][Pim], at low temperatures (173 K). The dominance of intermolecular atomic contacts in studied ILs was visualized by performing a Hirshfeld surface analysis. The CIF obtained from the crystal data was used to optimize the ILs, and the highest occupied molecular orbital−lowest unoccupied molecular orbital (HOMO− LUMO) energies were calculated using the DFT at the B3LYP/6-311G++ (d, p) level. Among the several interesting properties of [TMG]-based ILs, the CO 2 absorption capacity of [TMG][Glu] and [TMG][Pim] has been investigated through structural voids to establish the increase in CO 2 absorption with the addition of −CH 2 group on the anion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
