https://scholars.lib.ntu.edu.tw/handle/123456789/627447
標題: | Conformational-change-induced selectivity enhancement of CAU-10-PDC membrane for H2/CH4 and CO2/CH4 separation | 作者: | Chang, Chung Kai Yu, Hyun Jung Jang, Huiwon Hung, Ting Hsiang Kim, Jihan Lee, Jong Suk DUN-YEN KANG |
關鍵字: | membrane gas separation | Metal-organic framework | MOF membrane | 公開日期: | 5-十二月-2021 | 卷: | 1 | 期: | 1 | 來源出版物: | Journal of Membrane Science Letters | 摘要: | The separation of H2/CH4 or CO2/CH4 is critical to the purification of natural gas. Herein, we report on novel membranes with a metal-organic framework of CAU-10-PDC for the separation of these two mixtures. The dense CAU-10-PDC membranes are fabricated on a porous alumina support using the seeded growth method. An unexpected increase in selectivity was observed while testing mixed gas permeation with either H2/CH4 or CO2/CH4 at a molar ratio of 50:50. Steady-state selectivity reached 101 for H2/CH4 and 62 for CO2/CH4. Ideal selectivity measured from single gas permeation reached 475 for H2/CH4 and 288 for CO2/CH4. Molecular dynamics simulations and time-resolved X-ray diffraction with a synchrotron radiation source were used to probe conformational changes in CAU-10-PDC induced by exposure to CH4. When exposed to an atmosphere containing CH4, CAU-10-PDC presented a change in the space group (from I41/amd to I41), which drastically reduced the pore limiting diameter from 4.15 to 2.95 Å, rendering the channel nearly impermeable to CH4. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/627447 | ISSN: | 27724212 | DOI: | 10.1016/j.memlet.2021.100005 |
顯示於: | 化學工程學系 |
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