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Regulated Threshold Pressure of Reversibly Sigmoidal NH3 Absorption Isotherm with Ionic Liquids
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-14 , DOI: 10.1021/acssuschemeng.9b06555 Rongxing Qiu 1 , Xiaoyan Luo 1 , Le Yang 1 , Jiaran Li 1 , Xiaoyan Chen 1 , Cheng Peng 1 , Jinqing Lin 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-14 , DOI: 10.1021/acssuschemeng.9b06555 Rongxing Qiu 1 , Xiaoyan Luo 1 , Le Yang 1 , Jiaran Li 1 , Xiaoyan Chen 1 , Cheng Peng 1 , Jinqing Lin 1
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In this work, flexible hydrogen-bonded frameworks composed of amino pyridinium-based protic ionic liquids (ILs) marked as [X-PyH][Tf2N] were designed as NH3 absorption agents. Interestingly, NH3 absorption isotherm of these ILs present sigmoidal absorption isotherm (S mode), and the threshold pressure (TP) decreases from 75 to 6 mbar with the tunable of hydrogen bonded frameworks by varying the substituted group X. Combined with XRD characterizations, Fourier transform infrared and 1H NMR spectroscopies, thermometric analyses, and theory calculations, it indicates NH3 fixed by these ILs via acid–base interaction as well as hydrogen bonding based on the activation of sites through the fracture of the hydrogen-bonded frameworks, which would reform along with heat release when NH3 desorption. Therefore, S mode NH3 absorption with [3NH2-PyH][Tf2N] presents low TP of 6 mbar (6000 ppm) at 30 °C, and its NH3 capacity increases sharply and followed by a continuous increase to 3.85 mol/mol IL (175 mg/g IL) at 1.0 bar, which is higher than that of the reported ILs. The fixed NH3 could be desorbed completely in vacuum at 80 °C and 1 mbar. [3NH2-PyH][Tf2N] maintained its high capacity within 20 time recycles. The sigmoidal NH3 absorption would be considered as one of the potential approaches for its simultaneous efficient absorption and energy-saving separation at low concentrations.
中文翻译：
离子液体可逆S型NH 3吸收等温线的调节阈值压力
在这项工作中，由标记为[X-PyH] [Tf 2 N]的氨基吡啶基质子离子液体（IL）组成的柔性氢键构架被设计为NH 3吸收剂。有趣的是，这些离子分子的NH 3吸收等温线呈S型吸收等温线（S模式），并且通过改变取代基X的阈值压力（TP）从75毫巴降至6毫巴，且氢键骨架可调。结合XRD表征，傅立叶变换红外光谱和1 H NMR光谱，热分析和理论计算，表明NH 3这些IL通过酸碱相互作用以及基于氢键骨架断裂引起的位点活化的氢键固定，在NH 3解吸时会随着放热而重新形成。因此，用[3NH 2 -PyH] [Tf 2 N]吸收的S模式NH 3在30°C下的TP较低，为6 mbar（6000 ppm），并且其NH 3容量急剧增加，然后连续增加至3.85 mol / mol IL（175 mg / g IL）在1.0 bar下，高于所报道的ILs。固定的NH 3可以在80°C和1 mbar的真空中完全脱附。[3NH 2 -PyH] [Tf 2N]在20次循环中保持了高容量。S形NH 3吸收被认为是在低浓度下同时有效吸收和节能分离的潜在方法之一。
更新日期：2020-01-14
中文翻译：
离子液体可逆S型NH 3吸收等温线的调节阈值压力
在这项工作中，由标记为[X-PyH] [Tf 2 N]的氨基吡啶基质子离子液体（IL）组成的柔性氢键构架被设计为NH 3吸收剂。有趣的是，这些离子分子的NH 3吸收等温线呈S型吸收等温线（S模式），并且通过改变取代基X的阈值压力（TP）从75毫巴降至6毫巴，且氢键骨架可调。结合XRD表征，傅立叶变换红外光谱和1 H NMR光谱，热分析和理论计算，表明NH 3这些IL通过酸碱相互作用以及基于氢键骨架断裂引起的位点活化的氢键固定，在NH 3解吸时会随着放热而重新形成。因此，用[3NH 2 -PyH] [Tf 2 N]吸收的S模式NH 3在30°C下的TP较低，为6 mbar（6000 ppm），并且其NH 3容量急剧增加，然后连续增加至3.85 mol / mol IL（175 mg / g IL）在1.0 bar下，高于所报道的ILs。固定的NH 3可以在80°C和1 mbar的真空中完全脱附。[3NH 2 -PyH] [Tf 2N]在20次循环中保持了高容量。S形NH 3吸收被认为是在低浓度下同时有效吸收和节能分离的潜在方法之一。
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