一个坚固的以方形为基础的金属有机框架证明了对的高亲和力和选择性
Liangying Li1,2, Lidong Guo1, Zhiguo Zhang1,3
1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering , Zhejiang University , Hangzhou 310027 , People's Republic of China.
Journal of the American Chemical Society
|May 16, 2019
概括
一个新的金属有机框架 (MOF) 显示出异常选择性来分离 (Xe) 和 (Kr). 这种先进的吸附剂具有高Xe吸收和选择性,对于节能气体分离过程至关重要.
科学领域:
- 材料科学
- 化学工程
- 吸附科学
背景情况:
- 对于工业应用而言,有效分离 (Xe) 和 (Kr) 是至关重要的.
- 开发用于Xe/Kr分离的高选择性吸附剂仍然是一个重大挑战.
- 吸附分离是一种节能替代传统方法.
研究的目的:
- 开发一种新的金属有机框架 (MOF),用于高度选择性的Xe/Kr分离.
- 研究MOF的吸附性能和分离性能.
- 阐明增强Xe/Kr选择性的机制.
主要方法:
- 一种基于正方形的硬金属有机框架 (MOF) 的合成.
- 孔径大小和表面化学特征 (极性基组).
- 气体吸附等热量,突破性实验和密度函数理论 (DFT) 的计算.
主要成果:
- MOF的孔径为4.1 Å × 4.3 Å,非常适合XE的区别.
- 在0.2bar和环境温度下实现了创纪录的Xe/Kr选择性 (60.6) 和Xe吸收率 (58.4cm3/cm3).
- 报告的Xe亨利系数最高 (192.1 mmol/g/bar) 和Xe/Kr亨利选择性最高 (54.1).
- DFT计算证实了由于最佳孔径大小和极地表面的强烈Xe框架相互作用.
结论:
- 基于方形的MOF在Xe/Kr分离方面表现出卓越的性能.
- 孔径大小和极性功能之间的协同作用推动了高选择性.
- 这种MOF代表了贵重气体分离的吸附材料的重大进步.
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