A facile method for the fabrication of amine‐silica membranes with enhanced CO₂ separation performance was proposed via the thermally induced liberation of small molecules from quaternary ammonium salt. Quaternary ammonium‐silica (QA‐SiO_1.5) xerogel powders/films were fabricated via sol‐gel processing and their thermal stability was systematically studied using thermogravimetric mass spectrometer, Fourier transform infrared, energy dispersive spectroscopy, and positron annihilation lifetime spectroscopy analysis. CO₂ sorption performances of QA‐SiO_1.5 derived xerogel powders were quantitatively compared after assigning their relevant parameters to a dual‐mode sorption model. The gas permeation performances of membranes derived from QA‐SiO_1.5 were evaluated in terms of kinetic diameter and temperature dependence of gas permeance, and activation energy (E_p) required for gas permeation. The results indicate that liberation of the CH₃Cl molecules from these membranes significantly improved both CO₂ permeation and CO₂/N₂ separation capabilities. Therefore, the present study provides insight that should be useful in the development of high‐performance CO₂ separation membranes via the effect of the thermally induced liberation of small molecules. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1528–1539, 2018

中文翻译：

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通过热诱导CH3Cl的局部释放来增强叔胺-二氧化硅膜的CO2分离性能

提出了一种通过热诱导从季铵盐中释放小分子的方法来制造具有增强的CO ₂分离性能的胺-二氧化硅膜的简便方法。季铵-二氧化硅（QA-SiO _1.5）干凝胶粉末/薄膜是通过溶胶-凝胶工艺制备的，并使用热重质谱仪，傅里叶变换红外光谱，能量色散光谱和正电子an没寿命光谱分析系统地研究了它们的热稳定性。QA-SiO _1.5对CO _2的吸附性能将衍生的干凝胶粉末的相关参数分配给双模式吸附模型后，进行定量比较。根据动力学直径和气体渗透率的温度依赖性以及气体渗透所需的活化能（E _p）评估了QA-SiO _1.5衍生的膜的气体渗透性能。结果表明，CH ₃ Cl分子从这些膜上的释放显着改善了CO ₂渗透和CO ₂ / N ₂分离能力。因此，本研究提供了对开发高性能CO ₂有用的见解。分离膜通过热诱导小分子释放的作用。©2017美国化学工程师学会AIChE J，64：1528-1539，2018