基于循环的立方Zr (IV) 金属有机框架中的编程极化工程,以促进XE/Kr分离
Wei Gong1,2, Yi Xie3, Xingjie Wang2
1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
Journal of the American Chemical Society
|January 18, 2023
概括
研究人员开发了一种基于的新型金属有机框架 (MOF),用于高效的/分离. 这种材料NU-1107-Ag{I}通过调整框架的极化性来显示出高的选择性,为节能气体分离提供了有前途的方法.
科学领域:
- 材料科学
- 化学工程
- 分离科学
背景情况:
- 有效地分离 (Xe) 和 (Kr) 对于降低真空摇摆吸附 (VSA) 等过程中的能量消耗至关重要.
- 由于Xe和Kr的相似性质,使用常规方法对它们的选择性分离具有挑战性.
研究的目的:
- 开发一种能够进行Xe/Kr选择性分离的新型金属有机框架.
- 展示用于气体分离的MOF框架极化性的可编程工程策略.
主要方法:
- 一个立方基MOF平台的合成,NU-1107,与四酸核.
- 合成后化NU-1107与过渡金属离子,特别是Ag{I},以产生NU-1107-Ag{I}.
- 使用气体吸附测量和理想吸附溶液理论 (IAST) 预测的 Xe/Kr 分离性能评估.
- 使用密度功能理论 (DFT) 的计算和/分离的测试进行验证.
主要成果:
- 在合成的金属接MOF中,NU-1107-Ag (I) 呈现出最强的框架极化性.
- 在298K和1.0bar的20:80v Xe/Kr混合物中达到IAST预测的高选择性13.4.
- 与基于的MOF相比,Xe/Kr的分离性能已被证明是优越的,这种分离性能归因于环核和Ag{I}物种.
- 成功地应用了C3H6/C3H8分离的框架极化性调节策略.
结论:
- 在Zr-MOF,特别是NU-1107-Ag(I中对框架极化性的合成后工程使得高度选择性的Xe/Kr分离成为可能.
- 循环核和低价值的Ag ((I) 物种是提高框架极化性和分离性能的关键.
- 这种可通用的策略为定制气体分离提供了定制多孔材料的途径.
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