构象变化诱导的cu -10- pdc膜对H2/CH4和CO2/CH4分离选择性增强

IF 4.9 Q1 ENGINEERING, CHEMICAL
Chung-Kai Chang , Hyun Jung Yu , Huiwon Jang , Ting-Hsiang Hung , Chung-Kai Chang , Jihan Kim , Jong Suk Lee , Dun-Yen Kang
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引用次数: 10

摘要

H2/CH4或CO2/CH4的分离是天然气净化的关键。在此,我们报道了一种新型的膜与金属有机框架的cau10 - pdc分离这两种混合物。采用种子生长法在多孔氧化铝载体上制备了致密的cac -10- pdc膜。在H2/CH4或CO2/CH4摩尔比为50:50的混合气体渗透测试中,发现选择性出乎意料地增加。H2/CH4的稳态选择性为101,CO2/CH4的稳态选择性为62。单气体渗透测得的理想选择性H2/CH4为475,CO2/CH4为288。利用同步辐射源的分子动力学模拟和时间分辨x射线衍射技术,研究了CH4对cu -10- pdc结构的影响。当暴露于含有CH4的大气中时,cac -10- pdc的空间组发生了变化(从I41/amd到I41),孔隙极限直径从4.15急剧降低到2.95 Å,使通道几乎不渗透CH4。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Conformational-change-induced selectivity enhancement of CAU-10-PDC membrane for H2/CH4 and CO2/CH4 separation

Conformational-change-induced selectivity enhancement of CAU-10-PDC membrane for H2/CH4 and CO2/CH4 separation

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.

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