A novel anion-functionalized protic ionic liquid (IL), [DBUH][Triz], has been synthesized from 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU) and 1,2,4-triazole (Triz). Density (ρ) and viscosity (η) of [DBUH][Triz] at different temperatures have been measured and the influence of temperature has been analyzed quantitatively. Then, the applications of [DBUH][Triz] in CO2 absorption have been investigated. It has been detected that this ionic liquid, which was easily prepared, shows excellent reversibility and a high absorption capacity, about 1.5 mol CO2 per 1 mol of IL (about 0.3 g CO2 per 1 g of IL). In addition, the influence of temperature, pressure and moisture on the absorption performance of [DBUH][Triz] has been studied separately, indicating that absorption is promoted by lower temperature and higher CO2 pressure. In addition, the mechanism of chemical absorption at two active sites has been deduced based on quantum-chemical calculations and 13C NMR spectra coupled with IR spectra. Furthermore, the equilibrium constant of chemical absorption (K) was calculated from the CO2 capacity at different temperatures (T) and a good linear relationship between the natural logarithm of the equilibrium constant ln K and 1/T was obtained with R2 of 0.996. From the slope and intercept of the fitted straight line, the molar reaction enthalpy change (ΔrHm) and molar reaction entropy change (ΔrSm) were analyzed, indicating that the capture of CO2 is an exothermic process and the IL–CO2 complex is less ordered than the pure ionic liquid.

中文翻译：

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新型 DBU 基离子液体高效吸收 CO2

由 1,8-二氮杂双环 [5.4.0] undec-7-烯 (DBU) 和 1,2,4-三唑合成了一种新型阴离子功能化质子离子液体 (IL) [DBUH][Triz]。特里兹）。测量了[DBUH][Triz]在不同温度下的密度（ρ）和粘度（η），并定量分析了温度的影响。然后，研究了[DBUH][Triz]在CO2吸收中的应用。已检测到这种易于制备的离子液体显示出优异的可逆性和高吸收能力，每 1 mol IL 约 1.5 mol CO2（每 1 g IL 约 0.3 g CO2）。此外，还分别研究了温度、压力和水分对[DBUH][Triz]吸收性能的影响，表明较低的温度和较高的CO2压力促进了吸收。此外，基于量子化学计算和 13C NMR 光谱结合 IR 光谱，推导出了两个活性位点的化学吸收机制。此外，化学吸收的平衡常数 (K) 由不同温度 (T) 下的 CO2 容量计算得出，平衡常数 ln K 的自然对数与 1/T 之间具有良好的线性关系，R2 为 0.996。从拟合直线的斜率和截距，分析了摩尔反应焓变（ΔrHm）和摩尔反应熵变（ΔrSm），表明CO2的捕获是放热过程，IL-CO2复合物的有序性低于纯离子液体。化学吸收平衡常数 (K) 由不同温度 (T) 下的 CO2 容量计算得出，平衡常数 ln K 的自然对数与 1/T 之间具有良好的线性关系，R2 为 0.996。从拟合直线的斜率和截距，分析了摩尔反应焓变（ΔrHm）和摩尔反应熵变（ΔrSm），表明CO2的捕获是放热过程，IL-CO2复合物的有序性低于纯离子液体。化学吸收平衡常数 (K) 由不同温度 (T) 下的 CO2 容量计算得出，平衡常数 ln K 的自然对数与 1/T 之间具有良好的线性关系，R2 为 0.996。从拟合直线的斜率和截距，分析了摩尔反应焓变（ΔrHm）和摩尔反应熵变（ΔrSm），表明CO2的捕获是放热过程，IL-CO2复合物的有序性低于纯离子液体。