Reversible absorption of NF3 with high solubility in Lewis acidic ionic liquids

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2022-07, Vol.440, p.135902, Article 135902
• Main Authors: Ji, Jialan, Xiong, Wenjie, Zhang, Xiaomin, Peng, Lingling, Shi, Mingzhen, Wu, Youting, Hu, Xingbang
• Format: Article
• Language: English
• Subjects: Absorption; DFT calculation; Ionic liquids; Lewis acid; NF3
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.135902

•An effective method was developed for the NF3 capture.•[Omim][Fe2Cl7] exhibits high NF3 solubility (0.1801 mol/mol).•[Omim][Fe2Cl7] shows high absorption selectivity.•The interaction mechanism between LAILs and NF3 was proposed. It is urgent to find a way to capture Nitrogen trifluoride (NF3) with the increasing emissions during the expansion of the electronic industry. Due to the strong electron − withdrawing of F atom, the interactions between NF3 and most compounds are quite weak, making the capture of NF3 full of challenges. Herein, a pioneering attempt was made to capture NF3 in Lewis acidic ionic liquids (LAILs). Impressively, under the condition of 313.2 K and 1.0 bar, [Omim][Fe2Cl7] LAILs exhibited high NF3 solubility (0.1801 mol/mol), which is 64 and 180 times higher than that of [Emim][Ac] and [Bmim][PF6] respectively. The interaction mechanism between LAILs and NF3 was proposed with its reversible regeneration, which has been confirmed by FT − IR, Raman, and theoretical calculations. This work reveals a novel insight into industrial prospects and applications of NF3 capture.