在潮湿条件下将MOF-5分为封闭式和疏水式隔间

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Nan Ding¹, Haiwei Li¹, Xiao Feng¹

¹Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry, Beijing Institute of Technology , 5 South Zhongguancun Street, Beijing 100081, P. R. China.

Journal of the American Chemical Society

|August 2, 2016

概括

这项研究通过创建疏水区来增强碳捕获的金属有机框架 (MOF),在潮湿条件下显著提高二氧化碳的容量和选择性.

科学领域:

材料科学
化学工程
环境科学

背景情况:

由于高吸收率和选择性,金属有机框架 (MOF) 对碳捕获具有前景.
MOF的性能受到水分和在现实世界的烟气中竞争性的水吸附的影响.
对于有效的碳捕获,开发适合潮湿条件的稳定和选择性MOF至关重要.

研究的目的:

制定一项战略,以改善MOF在潮湿条件下的稳定性和二氧化碳捕获性能.
在MOF通道内创建疏水区,以减轻水的干扰.
提高燃烧后碳捕获应用的二氧化碳选择性和容量.

主要方法:

在MOF-5通道内的芳香乙烯在现场聚合,形成多乙烯隔断层.
修改MOF-5结构以创建封闭的疏水区 (PN@MOF-5).
测试改性MOF的CO2吸附能力,CO2/N2选择性和水分稳定性.

主要成果:

与原始MOF-5相比,修改后的MOF (PN@MOF-5) 的二氧化碳容量增加了一倍 (在273K,1bar时为78cm(3) /g).
PN@MOF-5的CO2/N2选择性增加了23倍 (212比9).
该材料显著提高了水分稳定性,在潮湿条件下循环使用时保持超过90%的动态二氧化碳吸附能力.

结论:

在现场聚合有效地分离了MOF通道,创造了可增强二氧化碳捕获的疏水环境.
开发的战略显著提高了MOF在潮湿烟气中的性能和稳定性,解决了关键的局限性.
这种方法为设计用于实际碳捕获技术的新型MOF聚合物复合材料提供了途径.

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