在金属有机框架中的孔空间分区,以实现高效的C2H2/CO2分离
Yingxiang Ye1,2, Zhenlin Ma1, Rui-Biao Lin2
1Fujian Provincial Key Laboratory of Polymer Materials, College of Chemistry and Materials Science , Fujian Normal University , 32 Shangsan Road , Fuzhou 350007 , PR China.
Journal of the American Chemical Society
|February 23, 2019
概括
一种新的多孔金属有机框架 (MOF),FJU-90,是使用多孔空间分区 (PSP) 方法合成的,用于高效的乙/二氧化碳分离. 这种MOF具有卓越的乙吸收能力,使其成为气体分离应用的理想选择.
科学领域:
- 材料科学
- 化学工程
- 纳米技术
背景情况:
- 开发用于选择性气体分离的先进材料对于工业过程至关重要.
- 金属有机框架 (MOF) 为气体吸附应用提供可调节的多孔性.
- 由于它们的特性相似,将乙 (C2H2) 与二氧化碳 (CO2) 分离起来是一个很大的挑战.
研究的目的:
- 设计和合成一种新型的MOF (FJU-90),用于高效的C2H2/CO2分离.
- 研究孔隙分割对气体吸附和分离性能的影响.
- 展示孔隙分割策略在创建先进的MOF材料方面的潜力.
主要方法:
- 通过孔隙空间分区 (PSP) 方法使用三角联体 (Tripp) 合成新型MOF (FJU-90).
- 对MOF的毛孔结构的描述,包括毛孔孔径的缩小.
- 在环境条件下对C2H2和CO2进行气体吸附测量 (298K,1bar).
- 应用综合吸附科学和技术 (IAST) 模型进行性能预测.
- 分子建模研究和实验突破实验进行验证.
主要成果:
- 孔隙分割方法成功地将FJU-90的孔隙孔径从12.0 × 9.4 Å2减少到5.4 × 5.1 Å2.
- 激活的FJU-90a在298K和1bar下显示出高C2H2吸收 (180cm3g-1) 和较低CO2吸收 (103cm3g-1).
- 对于50%:50%的C2H2/CO2混合物,FJU-90表现出优异的C2H2重力度,性能优于现有的MOF材料.
- IAST的计算,分子建模和突破性实验证实了材料的分离能力.
结论:
- 孔隙分区策略对于设计具有量身定制孔隙大小的MOF来说是非常有效的,以应对具有挑战性的气体分离.
- FJU-90是一种有前途的双功能MOF材料,可在环境条件下有效分离C2H2/CO2.
- 这项工作突出了用于气体分离应用的先进多孔材料的强大方法.
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