| 초록 |
Fine control of ultramicroporosity (< 7 Å) in carbon molecular sieve (CMS) membranes is highly desirable for challenging gas separation processes. Here, we propose a versatile approach to fabricate hybrid CMS (HCMS) membranes with unique textural properties as well as tunable ultramicroporosity. The HCMS membranes is formed by pyrolysis of a polymer nanocomposite precursor containing metal-organic frameworks (MOFs) as a carbonizable nanoporous filler. Detailed structural analyses reveal that the in-situ pyrolysis of embedded MOFs induces more densified and interconnected carbon structures in HCMS membranes compared to those in conventional CMS membranes, leading to bimodal and narrow pore size distributions in the ultramicroporous region. Eventually, the HCMS membranes exhibit excellent gas separation performances, especially for closely sized gas pairs (Δd < 0.5 Å) including CO2/CH4 and C3H6/C3H8 separations. |
