Enhanced NH3 capture by imidazolium‐based protic ionic liquids with different anions and cation substituents
Enhanced NH3 capture by imidazolium‐based protic ionic liquids with different anions and cation substituents
复制标题
具有不同阴离子和阳离子取代基的咪唑基质子离子液体增强 NH3 捕获
DOI：
10.1002/jctb.5467
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Suojiang Zhang
中科院分区：
文献类型：
--
作者：
Dawei Shang;Lu Bai;Shaojuan Zeng;Haifeng Dong;Hongshuai Gao;Xiangping Zhang;Suojiang Zhang
本文合成了10种质子型离子液体和常规离子液体，并对其进行了表征，测定了它们的密度、粘度和热分解温度。气液平衡实验结果表明，由于质子离子液体中质子氢原子的存在，使离子液体中的NH3容量大大高于常规离子液体，因此阳离子的链长对离子液体中NH3的溶解度影响不大.阳离子上的2-H原子影响NH3在质子离子液体和常规离子液体中的溶解度，随着压力的增加，其趋势不同。考虑到阴离子与阳离子[Bim]+的影响，NH3在质子离子液体中的溶解度顺序为[Bim][NTf 2] > [Bim][SCN] > [Bim][NO3]。[Eim][NTf 2]对NH3的动态吸附初步表明，在常压下，NH3的吸附速度较快，经过5次吸附和解吸循环后，NH3的吸附能力保持稳定。结论质子离子液体和常规离子液体的NH3溶解度与其结构之间存在一定的关系，表明质子离子液体可作为处理含NH3废气的替代材料。© 2017化学工业协会
BACKGROUNDIonic liquids have become potential absorbents to treat exhausted gases containing NH3, which threatens the living environment of human beings.RESULTSIn this study, 10 kinds of protic and conventional ILs were synthesized and characterized and their densities, viscosities and thermal decomposition temperatures measured. The NH3solubility in ILs from the vapor liquid equilibrium (VLE) experiments revealed that the chain length of cations had little influence on the NH3solubility of the protic ILs because of the high NH3capacities in protic ILs resulting from protic hydrogen atom compared with conventional ILs. The 2‐H atom on the cation influenced the NH3solubility in both protic and conventional ILs with different trends as the pressure was increased. Considering the effect of anions with the same cation [Bim]+, the order of NH3solubility in protic ILs was [Bim][NTf2] > [Bim][SCN] > [Bim][NO3]. Dynamic absorption of NH3in [Eim][NTf2] preliminarily revealed that the absorption was fast under ambient pressure and through 5 cycles of absorption and desorption, the NH3absorption ability remained stable.CONCLUSIONSThe relationship between the NH3solubility and the structures of both protic and conventional ILs was revealed, indicating the protic ILs as an alternative material for the treatment of NH3‐containing exhaust gases. © 2017 Society of Chemical Industry