NDLI: Efficient absorption of ammonia with hydroxyl-functionalized ionic liquids

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Xiangping Zhang, Xiaochun Li, Zhijie Zhang, Suojiang Dong, Haifeng Gao, Hongshuai Wang, Congmin Li, Jianwei
Copyright Year	2015
Abstract	Ammonia (NH3) emitted from the ammonia synthesis process is a kind of waste chemical resource and a major environmental pollutant. The traditional water scrubbing method suffers from high energy consumption due to the concentrated NH3 from aqueous ammonia. Therefore, it is desirable to develop novel absorbents for the efficient, reversible and environmentally-friendly recovery of NH3. In this paper, a series of hydroxyl-functionalized imidazolium ILs ([EtOHmim]X, X = [NTf2], [PF6], [BF4], [DCA], [SCN] and [NO3]) were designed and prepared. Their physical properties and NH3 absorption capacities under different temperatures and pressures were systematically investigated. The effects of hydroxyl cation, anionic structures, pressure and temperature on absorption performance were sufficiently studied. In addition, the absorption mechanism was investigated in detail by spectral analysis and quantum chemistry calculations. Compared with conventional IL [Emim]X, a higher absorption capacity was achieved by introducing the hydroxyl group on the imidazolium cation. The mechanism results showed the fascinating absorption performance of the task-specific ILs was attributed to the stronger hydrogen bonding interaction between NH3 and the H atom of the hydroxyl group. Considering the excellent absorption performance, high thermal stability, and super reversibility, this type of IL provides great improvement over conventional IL and shows their enormous potential in NH3 recovery.
Starting Page	81362
Ending Page	81370
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c5ra13730f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ammonia Hydroxy group Quantum chemistry Hydrogen Ion
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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