Fabrication and gas permeation of CMS/C composite membranes based on polyimide and phenolic resin
Fabrication and gas permeation of CMS/C composite membranes based on polyimide and phenolic resin
复制标题
聚酰亚胺/酚醛树脂CMS/C复合膜的制备及气体透过性能
DOI：
10.1039/c6ra12476c
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Wang Tonghua
中科院分区：
文献类型：
--
作者：
Wu Yonghong;Zhou Jialing;Zhang Bing;Zhao D;an;Li Lin;Lu Yunhua;Wang Tonghua
以1，4-二（4-氨基-2-三氟甲基苯氧基）苯-1，2，3，4-环丁烷四甲酸二酐型聚酰亚胺为前驱体，通过涂覆、干燥和热解，在酚醛树脂基炭片载体上制备了炭分子筛（CMS）膜。采用热重分析、电子显微镜、红外光谱、氮吸附和X射线衍射等方法对前驱体的热稳定性、CMS/C膜的形貌、官能团、孔结构和微观结构进行表征。考察了涂覆次数、热解温度、渗透温度和压力对CMS/C膜气体渗透性能的影响。此外，ZSM-5分子筛也被用作添加剂来调节CMS/C膜的微观结构和气体渗透。结果表明，在6次涂覆和650 °C热解的条件下，CMS/C膜的透气性和选择性最好。CMS/C膜的渗透性随着渗透温度的升高或热解温度的降低而提高。此外，ZSM-5的掺入降低了前体的热稳定性和所得CMS/C膜的气体渗透性。
Carbon molecular sieving (CMS) membranes were fabricated on a support of phenolic resin-based carbon sheets, using a 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene-1,2,3,4-cyclobutanetetracarboxylic dianhydride type polyimide as a precursor, through coating, drying and pyrolysis. The thermal stability of the precursor, the morphology, functional groups, porous structure and microstructure of the CMS/C membranes were characterized by thermogravimetric analysis, electron microscopy, infrared spectroscopy, nitrogen adsorption and X-ray diffraction, respectively. The effects of coating times, pyrolysis temperature, and permeation temperature and pressure on the gas permeation of the CMS/C membranes were investigated. In addition, zeolite ZSM-5 was also utilized as an additive to adjust the microstructure and gas permeation of the CMS/C membranes. The results show that the best gas permeability and selectivity could be attained for the CMS/C membranes under the fabrication condition of coating six times and a pyrolysis temperature of 650 °C. The permeability of the CMS/C membranes improves with an increase in the permeation temperature or a decrease in the pyrolysis temperature. Also, the incorporation of ZSM-5 reduces the thermal stability of the precursor and the gas permeability of the resultant CMS/C membranes.