支撑炭膜制备过程中的缺陷形成与避免(英文)

Defect formation and prevention during the preparation of supported carbon membranes

以酚醛树脂为前驱体在多孔石墨上制备了支撑炭膜。以树脂溶液涂覆支撑物表面,然后干燥、固化和炭化。涂膜-炭化的第一次循环不能有效地减小炭膜的缺陷。采用多次涂层、低冷却速率、低温和短时炭化(500℃,10 min),可同时降低一定程度的缺陷。因此炭膜的选择性能显著提高。

Supported carbon membranes were prepared using phenolic resin as the carbon precursor and porous graphite as the sup- port. The support was impregnated with the resin solution, dried, cured and carbonized to obtain a membrane layer. One-time coat- ing cannot effectively reduce the number of defects in the membrane. Repeated impregnation cycles to add more carbon layers, using a slow cooling rate during carbonization, performing carbonization at a low temperature and short time （500 ℃ and 10 min）, and coating the supported membranes with permeable polymers were used simultaneously to reduce the population of defects to a certain extent. As a result, gas separation selectivity of the membranes was significantly increased.