The development of promising dopants is essential for fabricating mixed matrix membranes with high gas separation performance. Here, mixed matrix carbon membranes (MMCMs) were produced by using polyimide as precursor and sepiolite as dopants on plate phenolic resin-based carbon supports via the processes of membrane formation and pyrolysis. The thermal stability, surface functional groups, microstructure and morphology of membrane samples were characterized by the thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray diffraction and scanning electron microscope, respectively. The effects of sepiolite amount on the microstructure and property of MMCMs were investigated. Besides, the change tendency of gas permeation with permeation temperature and permeation pressure was further examined. The results showed that the addition of sepiolite enhanced the thermal stability of the precursor membranes and the microstructural compactness of resultant MMCMs. Especially, it greatly improved the gas permeability and selectivity of MMCMs. The maximum separation performance was reached for MMCMs made by the sepiolite content of 0.2%, with the gas permeabilities of 8412.9 Barrer (H₂), 6711.5 Barrer (CO₂), 6062.0 Barrer (O₂) and 220.9 Barrer (N₂), and the selectivities of 38.1 (H₂/N₂), 30.4 (CO₂/N₂) and 27.4 (O₂/N₂). Moreover, the MMCMs can directly concentrate the mole fraction of O₂ from compressed air to 93%.

开发有前景的掺杂剂对于制造具有高气体分离性能的混合基质膜至关重要。在这里，通过使用聚酰亚胺作为前驱体和海泡石作为掺杂剂，在板状酚醛树脂基碳载体上，通过成膜和热解过程制备了混合基质碳膜（MMCM）。分别通过热重分析、傅里叶变换红外光谱、X射线衍射和扫描电子显微镜对膜样品的热稳定性、表面官能团、微观结构和形貌进行了表征。研究了海泡石用量对MMCMs微观结构和性能的影响。此外，进一步考察了气体渗透率随渗透温度和渗透压力的变化趋势。结果表明，海泡石的加入增强了前驱体膜的热稳定性和所得 MMCM 的微观结构致密性。特别是大大提高了MMCMs的透气性和选择性。海泡石含量为0.2%的MMCMs达到了最大分离性能，气体渗透率为8412.9 阻隔当量（H ₂），6711.5 阻隔当量（CO ₂），6062.0阻隔当量（O ₂）和220.9阻隔当量（N ₂），和38.1的选择性（H ₂ / N ₂），30.4（CO ₂ / N ₂）和27.4 (O ₂ /N ₂ )。此外，MMCM 可以直接将压缩空气中的 O ₂摩尔分数浓缩到 93%。