NaY沸石杂化炭膜的制备及气体分离性能的研究

Hybrid carbon membranes were prepared by film formation and carbonization using polyimide as a precursor and NaY zeolite as a dopant. The structure and properties of the membrane samples were characterized by scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, and infrared spectroscopy analysis. The effects of the dopant amount, permeation temperature, and permeation pressure on the structure and gas separation performance of the carbon membranes were investigated. The results show that, compared with pure carbon membranes, the permeability of the hybrid carbon membranes is significantly improved while maintaining a high O₂/N₂ selectivity; with the increase in the zeolite content in the membrane, the permeability of the hybrid carbon membranes is significantly increased. The hybrid carbon membrane prepared from a precursor with a zeolite mass fraction of 0.5% and carbonized at 650 °C has an O₂ permeability of 79.5 Barrer and an O₂/N₂ selectivity of 7.5.

以聚酰亚胺为前驱体,NaY型沸石为掺杂剂,经成膜和炭化制备了杂化炭膜.采用扫描电镜、X射线衍射、热重分析、红外光谱分析对膜样品的结构与性质进行了表征.考察了掺杂剂量、渗透温度与渗透压力对炭膜的结构及气体分离性能的影响.结果表明,与纯炭膜相比,杂化炭膜在保持高O_2/N_2选择性的前提下,渗透性显著提高;随着膜内沸石含量的提高,杂化炭膜的渗透性明显提高.由沸石质量分数为0.5%前驱体经650 ℃炭化所制备的杂化炭膜,对O_2的渗透性达79.5 Barrer,O_2/N_2选择性达7.5.