| 초록 |
A SSZ-13 membrane, having pore size of 0.37×0.42 nm2, has potential to separate CO2 (0.33 nm) from larger molecule N2 (0.364 nm) because of the molecular size differences. However, the non-zeolitic defects of SSZ-13 membranes make their separation ability worse and therefore, the methods to control the defects are highly needed. Here, we demonstrate that rapid thermal processing (RTP) treatment tunes the defects properties of as-synthesized films and increases their CO2 permselectivity. The maximum CO2/N2 separation factor (SF) at 50 °C with vapor increased from ~1.6 to ~10.1 through RTP treatment. We investigated the analysis of defects properties of SSZ-13 membranes through fluorescence confocal optical microscopy (FCOM) analyses complemented with the permeation modeling. FCOM analyses revealed that the defect size of RTP-treated membrane was reduced to ~2.2 nm against ~3.9 nm. The reduced defect size was attributed to the improvement of CO2 permselectivity. |
