基于MOF/COF的超薄和自支的复合膜,用于从炉气体中分离和净化气
Kai Qi1,2,3, Junmei Yu1, Yifei Gao1
1Department of Environmental Science & Technology, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China.
Langmuir : the ACS journal of surfaces and colloids
|June 7, 2024
概括
使用"MOF-in/on-COF"策略开发了用于从炉气体 (COG) 中分离的先进膜. 优化的ZIF-67-in-PBD膜实现了卓越的H2 / CH4选择性,超过了罗伯森的上限.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 分离技术 分离技术
背景情况:
- 焦炭炉气 (COG) 是大规模生产 (H2) 的关键来源.
- 膜分离为传统的H2分离方法提供了一种节能的替代方案.
- 金属有机框架 (MOFs) 和共价有机框架 (COFs) 显示出先进的膜设计的前景.
研究的目的:
- 设计和制造先进的分子选膜,以有效地从COG中分离H2/CH4.
- 通过使用ZIF-67和COF膜 (PBD) 调查"MOF-in/on-COF"孔隙修饰策略.
- 优化膜制备条件,以提高H2分离性能.
主要方法:
- 通过"MOF-in/on-COF"孔隙修饰策略合成ZIF-67-in-PBD膜.
- 在不同的制备参数下 (CO2+度,金属结合物比率,反应时间) 进行膜组成和微观结构的表征.
- 对H2/CH4分离性能的评估和分离机制的分析.
主要成果:
- 优化的ZIF-67-in-PBD膜呈现出密集,连续,超薄和自我支的结构.
- 性能最好的膜 (0.02mol/L Co2+,比例为1:4,6小时) 显示出最高的特定表面积和微孔比例.
- 实现了优越的H2/CH4选择性 (α = 33.48),超过了罗伯森的上限,并在MOF膜中处于领先地位.
结论:
- "MOF-in/on-COF"策略对于开发高性能H2分离膜是有效的.
- 优化的ZIF-67-in-PBD膜为COG的H2净化提供了一个有希望的解决方案.
- 分离机制主要由尺寸选控制,吸附选择性的贡献.
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