Abstract:The potential advantages of applying encapsulated ionic liquid (ENIL) to CO capture by chemical absorption with 1-butyl-3-methylimidazolium acetate [bmim][acetate] are evaluated. The [bmim][acetate]-ENIL is a particle material with solid appearance and 70 % w/w in ionic liquid (IL). The performance of this material as CO sorbent was evaluated by gravimetric and fixed-bed sorption experiments at different temperatures and CO partial pressures. ENIL maintains the favourable thermodynamic properties of the neat I… Show more
“…The only exception was [P 4,4,4,4 ][Ac] that is solid at temperatures below 333 K. The encapsulation of IL not only enhances the mass transport properties but also lets us use ILs that would not reach the thermodynamic equilibrium under reasonable conditions due to the kinetic limitations . This improvement is due to the large increase of the contact surface area between the gas phase and the amino acid IL, upon dispersion of the absorbent in submicrodrops, in good agreement with previous results , , , ,…”
Section: Resultssupporting
confidence: 87%
“…The carbon submicrocapsules ( C c ap ) were synthesized following the template method described in detail in previous works , , , , , . A model of a silica sphere with a solid core and mesoporous shell were used as template.…”
Ionic liquids have gathered special attention due to their potential for carbon dioxide capture, and their potential as solvents for mitigation of climate change. Following the scope of previous works, amino‐acid‐based ionic liquids encapsulated (ENILs) into carbonaceous submicrocapsules are here proposed as a novel material for CO2 capture. The ENILs prepared using tetrabutylphosphonium acetate ([P4,4,4,4][Ac]), used as reference, (2‐hydroxyethyl)trimethylammonium l‐phenylalaninate ([N1,1,1,2(OH)][L‐Phe]), (2‐hydroxyethyl)trimethylammonium l‐prolinate ([N1,1,1,2(OH)][L‐Pro]), and tetrabutylammonium l‐prolinate ([N4,4,4,4][L‐Pro]) were characterized by SEM, TEM, elemental analysis, TGA, and BET to assess their morphology, chemical composition, porous structure, and thermal stability. The absorption of CO2 on these materials was studied up to 0.5 MPa and 343 K. The desorption of CO2 from the saturated ENILs was evaluated, under mild conditions, evidencing these materials as promising agents for CO2 capture from post‐combustion sources, with high sorption capacity and fast and complete regeneration.
“…The only exception was [P 4,4,4,4 ][Ac] that is solid at temperatures below 333 K. The encapsulation of IL not only enhances the mass transport properties but also lets us use ILs that would not reach the thermodynamic equilibrium under reasonable conditions due to the kinetic limitations . This improvement is due to the large increase of the contact surface area between the gas phase and the amino acid IL, upon dispersion of the absorbent in submicrodrops, in good agreement with previous results , , , ,…”
Section: Resultssupporting
confidence: 87%
“…The carbon submicrocapsules ( C c ap ) were synthesized following the template method described in detail in previous works , , , , , . A model of a silica sphere with a solid core and mesoporous shell were used as template.…”
Ionic liquids have gathered special attention due to their potential for carbon dioxide capture, and their potential as solvents for mitigation of climate change. Following the scope of previous works, amino‐acid‐based ionic liquids encapsulated (ENILs) into carbonaceous submicrocapsules are here proposed as a novel material for CO2 capture. The ENILs prepared using tetrabutylphosphonium acetate ([P4,4,4,4][Ac]), used as reference, (2‐hydroxyethyl)trimethylammonium l‐phenylalaninate ([N1,1,1,2(OH)][L‐Phe]), (2‐hydroxyethyl)trimethylammonium l‐prolinate ([N1,1,1,2(OH)][L‐Pro]), and tetrabutylammonium l‐prolinate ([N4,4,4,4][L‐Pro]) were characterized by SEM, TEM, elemental analysis, TGA, and BET to assess their morphology, chemical composition, porous structure, and thermal stability. The absorption of CO2 on these materials was studied up to 0.5 MPa and 343 K. The desorption of CO2 from the saturated ENILs was evaluated, under mild conditions, evidencing these materials as promising agents for CO2 capture from post‐combustion sources, with high sorption capacity and fast and complete regeneration.
“…This result is related to chemical absorption capacity of CO 2 by the IL [bmim][OAc]. In this case CO 2 reacts with the imidazolium ring cation forming carboxylate thus increasing CO 2 absorption capacity (Chen et al., 2011; Moya et al., 2016; Zareiekordshouli et al., 2018; Ziobrowski et al., 2016). Fig.…”
Section: Resultsmentioning
confidence: 99%
“…% immobilized IL. Moya et al. (2016) used wet impregnation method to encapsulate IL in aluminum silicates.…”
Physical immobilization of ionic liquids (ILs) in solid materials appears as an interesting strategy for the development of new sorbents for CO
2
separation from natural gas. In this work the effect of physical immobilization of two ionic liquids with different anions (bmim[Cl] and bmim[OAc]) on two mesoporous supports (commercial silica SBA-15 and silica extracted from rice husk) was evaluated for CO
2
separation from natural gas by experimental determination of CO
2
sorption, CO
2
/CH
4
selectivity and sorption kinetics. Results showed that the pure supports present the greatest CO
2
sorption capacity when compared to immobilized ILs. However, CO
2
removal efficiency improves considerably in the CO
2
/CH
4
mixture when ILs are immobilized in these supports. The best selectivity results were obtained for supports immobilized with the IL bmim[Cl] and values increased for SIL-Cl by 37% and SBA-Cl 51% when compared with their respective supports. The contribution of SIL-Cl (3.03 ± 0.12) to separation performance (CO
2
/CH
4
) is similar to SBA-Cl (3.29 ± 0.39). ILs supported also presented fast sorption kinetics when compared to pure ILs thus being an interesting alternative in the search for highly efficient and low-cost separation processes.
“…with high specific surface area . The performance of ENIL materials was tested by different gas capture applications such as ammonia 31,44 and CO 2 in both physical 30,45 and chemical [46][47][48] absorption. These works concluded that the encapsulation of the IL does not decrease absorption capacities and increase very significantly the absorption rates, due to the strong increase of contact surface after IL encapsulation.…”
The removal of nitrogen oxides (NO x) has been extensively studied due to their harmful effects to health and environment. In this work, Encapsulated Ionic Liquids (ENILs) are used as catalysts for the NO oxidation at humid conditions and low temperatures. Hollow carbon capsules (C Cap) were first synthetized to contain different amounts of 1-butyl-3-methylimidazolium nitrate IL ([bmim][NO 3 ]), responsible for the catalytic oxidation. Then, the materials were characterized using different techniques, by analyzing microstructure, porosity, elemental composition and thermal stability. The catalytic performance of ENIL materials was tested for NO conversion at different conditions. Thus, NO concentration was fixed at 2,000 ppm at dry and humid conditions. Then, the methanol promotion of the reaction was demonstrated, increasing the NO conversion values in all cases, and the alcohol/water ratio was optimized. The temperature effect was studied as well, using the optimal conditions based on the previous measurements. The results reflect that humid conditions do not have a negative effect in terms of NO conversion when using ENILs, opposite behavior as the observed for C Cap and traditional catalysts studied before. Low amount of IL inside the material (40% in mass) was found to be the optimum for the task, reaching conversions of almost 45% in near industrial conditions of temperature and O 2 and H 2 O concentrations in the flue gas with a GHSV = 10,000 h-1 .
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