二氧化碳和乙在两个同结构铜二氧化碳酸框架中的反向分离
Jing-Hong Li1, You-Wei Gan1, Jun-Xian Chen1
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou, 510275, China.
Angewandte Chemie (International ed. in English)
|May 12, 2024
概括
研究人员使用定制的金属有机框架 (MOF) 逆转了二氧化碳 (CO2) 和乙 (C2H2) 的分离. 较小孔的MOF可以选择性地吸附CO2而不是C2H2,从而实现高效的气体分离.
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.
- 分离科学 分离科学
背景情况:
- 从二氧化碳 (CO2) 中分离乙 (C2H2) 是至关重要的,但由于类似的分子性质,很难.
- 传统的吸附分离方法难以实现,因为乙的极化性更高,导致结合更强.
研究的目的:
- 通过设计具有特定孔隙结构的金属有机框架 (MOFs) 来扭转CO2/C2H2分离中的典型选择性.
- 为了实现对C2H2的选择性二氧化碳吸附,使用量身定制的超微性MOF.
主要方法:
- 合成了两种异构型超微的金属有机框架 (MOF) 具有不同的孔径大小:铜异基酸盐 (Cu(ina) 2) 和铜氨酸-5-碳酸盐 (Cu(Qc) 2).
- 在环境条件下研究的气体吸附特性.
- 使用中子粉衍射来确认分子方向和结合配置.
- 进行动态突破实验以验证分离性能.
主要成果:
- 具有较大的毛孔的铜异基酸 (Cu(ina) 2) 呈现出C2H2-选择性吸附 (C2H2/CO2选择性为3.4).
- 具有较小孔径的铜林-5-碳酸盐 (Cu(Qc) 2) 证明了逆CO2选择性吸附 (CO2/C2H2选择性为5.6).
- 中子衍射揭示了Cu(Qc) 2的紧毛孔中偏好的CO2方向,阻碍了C2H2的吸附.
- 突破性实验证实了Cu(Qc) 2在CO2/C2H2分离中的有效性.
结论:
- 定制MOF孔隙结构是一种有效的策略,可以逆转气体吸附选择性.
- Cu(Qc) 2显示出有效的CO2/C2H2分离的巨大潜力,克服了以前的限制.
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