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在高湿度下改善二氧化碳捕获的物理吸收剂中调整疏水性和孔隙环境

Xiaoliang Wang¹, Maytham Alzayer², Arthur J Shih³

¹Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society

|January 31, 2024

概括

新设计的含有甲基的金属有机框架 (MOF) 在潮湿条件下增强了二氧化碳 (CO2) 捕获. 这些强大的吸附剂克服了先前材料的局限性,使其能够从潮湿的工业烟气中实际捕获二氧化碳.

科学领域:

材料科学
化学工程
环境科学

背景情况:

基于三酸盐的CALF-20金属有机框架 (MOF) 对二氧化碳捕获具有前景,但受到40%以上相对湿度 (RH) 的水吸附限制.
这种湿度敏感性阻碍了在燃烧后烟气等环境中的实际应用,其中二氧化碳被水和.

研究的目的:

设计和合成具有改善疏水性的新型MOF,以在潮湿条件下有效捕获CO2.
调查甲基对基于三酸盐的MOF的二氧化碳吸附性能和水分稳定性的影响.

主要方法:

合成了三种新的MOF (NU-220,CALF-20M-w,CALF-20M-e),其中包括性甲基酸连接剂.
在不同相对湿度下对二氧化碳捕获能力和选择性的实验性评估.
大法典蒙特卡罗 (GCMC) 模拟以阐明水相互作用和二氧化碳选择性的机制.

主要成果:

在70%的RH下,CALF-20M-w和CALF-20M-e保持了超过20%的二氧化碳捕获效率,而CALF-20的吸收效率是可以忽略的.
GCMC模拟表明,甲基阻碍了水网络的形成,并在潮湿的环境中提高了CO2对N2的选择性.
辐射分布函数显示甲基增加了水分子和Zn协调点之间的距离,改善了水分稳定性.

结论:

将甲基组纳入三酸连接剂是一种有效的策略,可以提高基于的MOF的水分稳定性和二氧化碳捕获性能.
开发的MOF (CALF-20M-w和CALF-20M-e) 在高湿度的实际工业应用中显示出强大的二氧化碳捕获潜力.
这种设计方法为碳捕获技术提供了更有弹性的吸收材料.

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