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用于气体吸附和分离的灵活的微孔有机框架

Hailong Wang¹, Bin Li¹, Hui Wu

¹†Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States.

Journal of the American Chemical Society

|July 28, 2015

概括

一个新的结有机框架 (HOF-5) 显示了灵活性和高透性. 由于其独特的孔隙结构,这种材料在环境条件下有效地捕获二氧化碳和乙.

科学领域:

材料科学
化学学
纳米技术

背景情况:

带有结的有机框架 (HOF) 是一种具有调节性质的多孔材料.
开发具有增强气体吸附能力的新型HOF对于气体储存和分离的应用至关重要.

研究的目的:

使用新型有机链接器构建和描述一个新的三维HOF (HOF-5).
研究激活HOF-5a的气体吸附特性,特别是二氧化碳和乙.

主要方法:

使用 4,4',4′′,4′′'-tetra(2,4-diamino-1,3,5-triazin-6-yl) tetraphenylethene 的方法合成HOF-5.
粉末X射线衍射 (PXRD) 用于结构分析和框架收缩的确定.
在77K的 (N2) 吸附-脱附等温器中,以评估孔隙性和表面积 (BET).
粉末中子衍射和理论计算以阐明气体封装机制.

主要成果:

HOF-5被成功合成并激活为HOF-5a,体积显著收缩约21%.
激活的HOF-5a显示了一个Brunauer-Emmett-Teller (BET) 的表面积为1101 m2/g.
HOF-5a显示了阶段性N2吸附等温,表明了框架的灵活性.
在环境条件下观察到大量的乙和二氧化碳.
粉末中子衍射和理论计算证实了二氧化碳在毛孔中的伪一维阵列中的封装.

结论:

HOF-5a是一种灵活,多孔的材料,具有储气应用的潜力.
由于HOF-5a具有独特的孔隙特性,可以有效捕获二氧化碳和乙.
这项研究强调了针对性气体吸附的HOF的结构性质关系.

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