Abstract This study examined the thermodynamic stability and guest gas inclusion of tetra-iso-amyl ammonium bromide (TiAAB) semiclathrates with CO2, N2, or CO2 (20%) + N2 (80%), with a primary focus on semiclathrate phase equilibria and Raman spectra. The three-phase (H-LW-V) equilibria of TiAAB semiclathrates with CO2, N2, or CO2 (20%) + N2 (80%) were measured at a stoichiometric concentration (TiAAB 3.7 mol%) using both a conventional isochoric method and a stepwise differential scanning calorimeter (DSC) method. The phase equilibria demonstrated that TiAAB (3.7 mol%) semiclathrates with CO2, N2, or CO2 (20%) + N2 (80%) were significantly stabilized compared with the corresponding CO2, N2, or CO2 (20%) + N2 (80%) gas hydrates. The enclathration of CO2 and N2 molecules in the cages of TiAAB semiclathrates was clearly confirmed via Raman spectroscopy. The experimental results indicate that TiAAB semiclathrates can incorporate CO2 and N2 into the cage lattices at elevated temperatures and lowered pressures and are potential materials for CO2 capture.

中文翻译：

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四异戊基溴化铵 (TiAAB) 半包合物与 CO2、N2 或 CO2 + N2 的相平衡

摘要 本研究研究了四异戊基溴化铵 (TiAAB) 半包合物与 CO2、N2 或 CO2 (20%) + N2 (80%) 的热力学稳定性和客体气体夹杂，主要关注半包合物相平衡和拉曼光谱。使用常规等容方法在化学计量浓度 (TiAAB 3.7 mol%) 下测量 TiAAB 半包合物与 CO2、N2 或 CO2 (20%) + N2 (80%) 的三相 (H-LW-V) 平衡和逐步差示扫描量热仪 (DSC) 方法。相平衡表明，与相应的 CO2、N2 或 CO2 (20%) + N2 (80) 相比，TiAAB (3.7 mol%) 半包合物与 CO2、N2 或 CO2 (20%) + N2 (80%) 显着稳定%) 气体水合物。通过拉曼光谱清楚地证实了 TiAAB 半包合物笼中 CO2 和 N2 分子的包合。实验结果表明，TiAAB 半包合物可以在升高的温度和降低的压力下将 CO2 和 N2 结合到笼状晶格中，并且是潜在的 CO2 捕获材料。