Highly efficient absorption and separation of NH3 by simple lithium deep eutectic solvents

Li, Ké; Zong, Kai; Zhou, Ziyue; Deng, Dongshun

doi:10.1016/j.seppur.2021.119763

Cited by 27 publications

(12 citation statements)

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“…Therefore, the effect of water on NH 3 solubilities in metal‐based DESs prepared in this work is very minor. Table 2 presents the comparison of NH 3 solubilities in different DESs and ILs 25,36–50,65–76 . It is found that the solubilities of NH 3 in metal‐based DESs prepared in this work are remarkably high, especially at low pressures.…”

Section: Resultsmentioning

confidence: 83%

“…Therefore, DESs have the potential to replace ILs for highly efficient and reversible gas absorption. [31][32][33][34][35] As for the application of DESs in reversible NH 3 absorption, there have been some impressive examples such as ChCl + PhOH + EG DESs, 36 NH 4 SCN + Gly DESs, 37 EaCl + Gly DESs, 38 ChCl + TetrZ + EG DESs, 39 MAA + TetrZ DESs, 40 [Im][NO 3 ] + EG DESs, 41 [emim]Cl + BenTriz DESs, 42 [ImH] Cl + Gly DESs, 43 LiCl/EG DESs, 44 and [MeC OH 3 N]Cl/U. 45 After careful examination on these DESs, it can be found that they are typically constituted by one weak acidic compound (e.g., PhOH, NH 4 46 EaCl + Res DESs, 47 and [TMPDA]Cl 2 + PhOH DESs 48 ).…”

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confidence: 99%

“…25,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][65][66][67][68][69][70][71][72][73][74][75][76] It is found that the solu-…”

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confidence: 99%

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Remarkable NH₃ absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Cheng

Lan

et al. 2022

AIChE Journal

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The elimination and recycling of NH3 from the vented circulating stream of NH3 synthesis process is of great significance to the protection of air environment and saving of NH3 product. Deep eutectic solvents (DESs) with as many weak acidic sites as possible are anticipated to exhibit high efficiency for NH3 absorption at low pressures. Herein, we designed and prepared a series of metal‐based DESs by mixing EaCl, metal chloride (SnCl2, ZnCl2, FeCl3, or CoCl2), and Gly. The physiochemical properties, NH3 absorption performance, and mechanism of prepared metal‐based DESs were investigated systematically. It is found that considerably high solubilities of NH3 in DESs can be achieved by utilizing the multiple coordination and hydrogen‐bond interaction with NH3 provided by metal ions and Gly respectively. The values of NH3 solubilities (17.55 mol/kg at 298.2 K and 103.0 kPa, and 10.24 mol/kg at 298.2 K and 6.8 kPa) are the highest reported to date.

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Section: Resultsmentioning

confidence: 83%

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confidence: 99%

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Remarkable NH₃ absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Cheng

Lan

et al. 2022

AIChE Journal

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“…In the past two decades, protic ionic liquids (ILs), − ILs substituted with the hydrogen donor, , and ILs with the metallic anion were developed for efficient and reversible absorption of NH 3 . Deep eutectic solvents mixed with hydrogen-bond acceptors and various hydrogen-bond donors − have been proposed as very promising NH 3 absorbents through Lewis acid–base interaction and hydrogen-bonding interaction by taking advantage of the essence of ammonia as a Lewis base and a hydrogen acceptor . Polyionic liquids (PILs) combine the thermal stability of the polymer and the flexible structure of ILs, promoting PILs as adsorbents. , Designing PILs with outstanding capacity and high reversibility could be a potential challenge for the application of gas adsorption. , Metallic PILs with high reversible and efficient NH 3 uptake through competitive and cooperative interactions were proposed in our previous work .…”

Section: Introductionmentioning

confidence: 99%

Role of Structure in the Ammonia Uptake of Porous Polyionic Liquids

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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In this work, tunable NH 3 uptake of polyionic liquids (PILs) are reported through regulating the size of the cross-linking agent R, the metallic anion M(II) (SCN) 4 2− , where M are Co, Zn, and Cu, and the cationic polymer framework of PILs. Combined with NH 3 uptake experiments, spectroscopic analysis, and DFT calculation, the NH 3 uptake was proposed as the coordination with M(II) to generate M(NH 3 ) n 2+ , where n = 6 when M = Co and n = 4 when M = Cu and Zn, which suggests that the NH 3 capacity is dominated by the metal center for different coordinative numbers. The increase in the size of R benefits the high capacity of NH 3 uptake for more metallic anions to be exchanged and promotes NH 3 desorption for the enhancement of porosity of PILs; however, the oversize of R goes against porosity and NH 3 desorption. There seems to be less effect of the cation on ammonia uptake, while the stable cationic polymer framework protects the PILs from collapse. Overall, the tunable porosity (surface area of 15.9−869.0 m 2 /g and total volume of pores of 0.011−0.695 cm 3 /g) and NH 3 uptake properties (capacity of 11.6−20.1 mmol/g PIL) as well as feasible NH 3 desorption of PILs are realized for the flexible structural design of PILs. Furthermore, the adsorbed H 2 O and SO 2 on NH 3 uptake of PVIm-R8-Co were investigated. The investigation in this work makes the role of the structure of PILs in ammonia uptake clearer and provides the designability of PILs for gas adsorption and other applications.

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“…It is the H-bonding interaction between HBA and HBD that dramatically lowers the melting point of DESs . Compared to ILs, DESs have the merits of lower cost and toxicity, facile preparation, and designability , along with other attributes, e.g., negligible volatility, electric conductivity, viscosity, and thermal stability. − Thus, DESs are more attractive for gas absorption, and extensive studies have been reported for various gas solubilities, e.g., CO 2 , − HFCs, SO 2 , − H 2 S, NO, − NO 2 , , and NH 3 . − …”

Section: Introductionmentioning

confidence: 99%

Solubility Behavior and the Mechanism of HCl Gas in Four [EMIM]Cl-Based Deep Eutectic Solvents

et al. 2022

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The solubility behavior of HCl gas in four 1-ethyl-3-methylimidazolium chloride([Emim]Cl)-based deep eutectic solvents (DESs), i.e., an [Emim]Cl mixture with 4-methylimidazole (DES1), 2-methylimidazole (DES2), malonic acid (DES3), and poly(ethylene glycol) 400 (DES4), was studied at 301.15−348.15 K and a 0−101.325 kPa partial pressure of HCl. The H-bonding interaction and the dissolution mechanism were studied via Fourier-transform infrared spectroscopy (FTIR), 1 H NMR, and 13 C NMR. The HCl solubility increases with the alkalinity of the DESs and its H-bonding interaction with the solvent and follows the order DES1 > DES2 > DES4 > DES3. The HCl solubility in DES1 is 0.584 g-HCl/g-DES with partially irreversible desorption due to its chemical interaction with HCl. In contrast, HCl is physically dissolved in DES3 and DES4 with facile and reversible desorption. The solution viscosity decreases sharply and the density increases slightly as the absorption proceeds. Considering its higher solubility, thermal stability, and facile desorption, DES4 is more viable for HCl absorption. The result is instructive for the development of a greener recovery process for HCl gas and the selection of efficient DESs.

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Highly efficient absorption and separation of NH3 by simple lithium deep eutectic solvents

Cited by 27 publications

References 50 publications

Remarkable NH₃ absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Remarkable NH₃ absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Role of Structure in the Ammonia Uptake of Porous Polyionic Liquids

Solubility Behavior and the Mechanism of HCl Gas in Four [EMIM]Cl-Based Deep Eutectic Solvents

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Highly efficient absorption and separation of NH3 by simple lithium deep eutectic solvents

Cited by 27 publications

References 50 publications

Remarkable NH3 absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Remarkable NH3 absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Role of Structure in the Ammonia Uptake of Porous Polyionic Liquids

Solubility Behavior and the Mechanism of HCl Gas in Four [EMIM]Cl-Based Deep Eutectic Solvents

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Remarkable NH₃ absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction

Remarkable NH₃ absorption in metal‐based deep eutectic solvents by multiple coordination and hydrogen‐bond interaction