在金属有机框架中通过多个金属位点相互作用分离烯异构体
Miguel I Gonzalez, Matthew T Kapelewski, Eric D Bloch
1Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States.
Journal of the American Chemical Society
|February 16, 2018
概括
金属有机框架有效地分离了具有挑战性的C8基色素,如烯异构体. Co2 ((dobdc) 显示出显著的选择性,根据结合亲和力和毛孔包装区分所有四种异构体.
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:
- 由于分子相似性,分离C8基基 (o-xylene,m-xylene,p-xylene,乙烯) 在工业上具有挑战性.
- 现有的分离方法与这些同位素的密切物理和化学特性作斗争.
研究的目的:
- 评估金属有机框架 (MOF) 的有效性,特别是CO2 ((dobdc) 和CO2 ((m-dobdc),用于分离C8基芳香物.
- 研究这些MOF对烯异构体和乙烯的吸附行为和选择性.
主要方法:
- 采用了单组件吸附异热和多组件突破测量.
- 使用单晶X射线衍射进行了结构性表征.
- 进行了液相吸附测量,以评估度的选择性.
主要成果:
- Co2 ((dobdc) 显示出显著的选择性,区分了所有四种C8基基与结合亲和度顺序:o-xylene > ethylbenzene > m-xylene > p-xylene.
- 这种选择性在多组分液相吸附中保持在广泛的度范围内.
- Co2 ((dobdc) 在与o-xylen或乙烯相互作用时表现出意想不到的结构扭曲,促进了增强的客分子容纳.
结论:
- Co2 ((dobdc) 是一种高效的材料,可用于选择性地分离C8基酸盐,包括异构体.
- 分离机制涉及与中心和MOF孔内的异构体包装的特定相互作用.
- 二氧化碳的动态结构反应提高了其分离能力.
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