Protic ionic liquid [Bim][NTf2] with strong hydrogen bond donating ability for highly efficient ammonia absorption
Protic ionic liquid [Bim][NTf2] with strong hydrogen bond donating ability for highly efficient ammonia absorption
复制标题
具有强氢键供给能力的质子离子液体[Bim][NTf2]，可高效吸收氨
DOI：
10.1039/c6gc03026b
复制
发表时间：
2017
期刊：
影响因子：
9.8
通讯作者：
Zhang Suojiang
中科院分区：
文献类型：
--
作者：
Shang Dawei;Zhang Xiangping;Zeng Shaojuan;Jiang Kun;Gao Hongshuai;Dong Haifeng;Yang Qingyuan;Zhang Suojiang
经济高效且对环境无害的含氨废气处理一直是一个挑战。离子液体(ILS)因其独特的结构和性质被认为是潜在的吸收NH3的溶剂。本研究设计合成了具有不同氢键供体能力的三种离子液体[Bmim][NTf2]、[Bim][NTf2]、[HOOC(CH2)3mim][NTf2]，并用热力学解离常数(PKA)对其进行了表征。结果表明，具有中等pKa值的质子型离子液体(PIL)[Bim][NTf2]对NH3的吸附能力最高(在313K，100kPa时达到2.69molNH3/molIL)。实验表征和理论计算证实，[Bim][NTf2]对[Bim][NTf2]如此高的NH3吸附容量是咪唑环上的H-3与NH3分子相互作用以及NH3分子自身烧结的结果。此外，在四个循环中，[Bim][NTf2]的吸收性能稳定，这意味着NH3回收在行业中具有潜在的应用前景。
Cost-efficient and environmentally benign treatment of NH3-containing exhaust gas has been a challenge. Ionic liquids (ILs) due to their unique structures and properties are recognized as potential solvents to absorb NH3. In this study, three types of ILs, including [Bmim][NTf2], [Bim][NTf2], [HOOC(CH2)3mim][NTf2], were designed and synthesized with various hydrogen bond donating abilities and characterized based on their thermodynamic dissociation constants (pKa). The results showed that protic ionic liquid (PIL) [Bim][NTf2] with a moderate pKa value had the highest NH3 absorption capacity (up to 2.69 mol NH3 per mol IL, 313 K, 100 kPa). Experimental characterization and theoretical calculations verified that such extremely high NH3 absorption capacity for [Bim][NTf2] resulted from the interactions between H-3 on the imidazole ring and the NH3 molecule and NH3 molecules sintering themselves. Furthermore, stable absorption performance was recorded for [Bim][NTf2] over four cycles, implying potential applications in the industry for NH3 recycling.