Chelation‐activated multiple‐site reversible chemical absorption of ammonia in ionic liquids

Abstract

Developing new and facile strategies for multiple-site reversible chemical absorption of pollutant gases is of wide interests in chemical engineering research. Herein, a series of lithium (Li)-triethylene glycol (TEG)-chelated ionic liquids (ILs) with crownether-like cation and different anions were designed. The Li-TEG-chelated ILs were prepared in quantitative yields by simply mixing equimolar TEG and Li salts. It is found that the chelation of TEG with Li + activates the hydroxyl sites in TEG for strong interaction with ammonia (NH 3 ). Thus, the hydroxyl sites chelated with Li + , as well as the chelation-unsaturated Li + , provide the multiple sites for chemical absorption of NH 3 in Li-TEG-chelated ILs. Moreover, the absorption of NH 3 in Li-TEGchelated ILs is totally reversible, with the NH 3 solubilities remaining unchanged after eight times of recycling. The results obtained herein can provide useful guidance for the construction of gas absorbents with high capacity and excellent reversibility.

Ionic Liquids Endowed with Novel Hybrid Anions for Supercapacitors

“…Ionic liquids (ILs), as a state-of-the-art kind of ambient temperature molten salt, have captured intensive insights because of their green characteristic. Close attention to the ILs has been widely paid in various aspects, such as electrolytes, − energy applications, − catalytic reactions, , material modifications, , and efficient gas absorbents. − Compared with the traditional organic electrolytes, they are considered to be more secure because of their negligible vapor pressure, high thermal stability, and nonflammability, which have therefore been considered as a substitute for organic electrolytes in EDLCs. The cations and anions do not match in terms of size and tend to exhibit some degree of charge delocalization due to the weak interaction between the constituent ions, which is usually responsible for their high ionic conductivity.…”

Magnetic deep eutectic solvents: formation and properties

“…[19][20][21] Furthermore, they manifested a notable performance in gas separation based on the coordination ability of metal ions as well. 22,23 This type of DES typically includes a magnetic transition metal, such as Fe(III), Co(II), Ni(II), Mn(II) and Zn(II), called magnetic DESs (MDESs) here. The physicochemical properties of MDESs are important to help us to understand their features and have a better application in various fields.…”

Optimizing Reaction-Absorption Process for Lower Pressure Ammonia Production

“…Previous reports have shown the promise of using absorber columns packed with metal halides that can enable ammonia production at lower pressure. There are other materials that are proposed to separate gaseous ammonia, such as ionic liquids, eutectic solvents, zeolite, polymeric sorbents, etc. The ammonia sorption capacity of some of the newly developed absorbents and their suitable sorption conditions are summarized in Table S1.…”