| 초록 |
Because of its suitable pore size, CHA type zeolite can separate CO2 from larger molecules (N2 or CH4). However, the process to control the non-zeolitic defects of CHA type membranes are limited. In this work, we introduced rapid thermal processing (RTP) of as-synthesized CHA type membranes to increase their potential of CO2 separation and adjust their microstructural defect properties. Because of decrease of defective region, the maximum CO2/N2 separation factor (SF) at 30 °C improved after RTP treatment. Moreover, when water vapor is added to the feed, the CO2/N2 SF of the RTP-treated CHA membrane increased than the conventionally calcined counterpart. Furthermore, this RTP-treated CHA membrane provided much improved max CO2/CH4 SFs at 50 °C under wet conditions. From the result of fluorescence confocal optical microscopy analyses, the decreased defect size of RTP-treated CHA membrane is well demonstrate its high CO2 permselectivity. |
