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

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 efficienc...

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Bibliographic Details
Published in:AIChE journal 2022-06, Vol.68 (6), p.n/a
Main Authors: Cheng, Ning‐Ning, Li, Zi‐Liang, Lan, Hong‐Chao, Xu, Wen‐Long, Huang, Kuan
Format: Article
Language:English
Subjects:
Absorption
Ammonia
Coordination
deep eutectic solvent
Ferric chloride
hydrogen bond
Metal chlorides
Metal ions
Metals
multiple site
NH3 absorption
Physiochemistry
Solubility
Solvents
Zinc chloride
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Summary: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.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.17660