The high viscosity of ionic liquids (ILs) limits their practical application in SO₂ capture. In this work, the low viscous aminoalkyl-phenyl-silanes were synthesized to capture SO₂. The π–π interaction between phenyl groups reduced the volatility of aminoalkyl-phenyl-silanes greatly, but it did not increase their viscosity significantly. Among them, N-[(dimethylphenylsilyl)methyl]-N-methylbenzenemethanamine (DPSA) containing two phenyl groups exhibited the strongest π–π interaction. Therefore, the thermal decomposition temperature reached 150°C, while its viscosity was only 8.45 mPa·s at 25°C, which is much lower than that of ILs. The absorption enthalpy and entropy change of DPSA absorption reaction were −79.284 kJ/mol and −224 J/mol/K, respectively. These values are more negative than those of SO₂ capture reaction with ILs. An objective function was proposed to obtain the optimal absorption and desorption temperature. Furthermore, five cycles of regeneration experiments indicated that DPSA possessed good regeneration ability.

中文翻译：

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具有 π-π 相互作用的低粘度氨基烷基苯基硅烷及其最佳 SO2 捕获条件

离子液体（ILs）的高粘度限制了它们在SO ₂捕集中的实际应用。在这项工作中，合成了低粘度氨基烷基-苯基-硅烷以捕获 SO ₂。苯基之间的π - π相互作用大大降低了氨基烷基-苯基-硅烷的挥发性，但并没有显着增加其粘度。其中，含有两个苯基的N-[(二甲基苯基甲硅烷基)甲基]-N-甲基苯甲胺(DPSA)表现出最强的π - π相互作用。因此，热分解温度达到150℃，而在25℃时其粘度仅为8.45 mPa·s，远低于ILs。DPSA吸收反应的吸收焓和熵变分别为-79.284 kJ/mol和-224 J/mol/K。这些值比与 IL 的 SO ₂捕获反应的值更负。提出了一个目标函数来获得最佳的吸收和解吸温度。此外，5个循环的再生实验表明DPSA具有良好的再生能力。