Development of ultramicropore-mesopore interconnected pore architectures for boosting carbon dioxide capture at low partial pressure
Development of ultramicropore-mesopore interconnected pore architectures for boosting carbon dioxide capture at low partial pressure
复制标题
开发超微孔-介孔互连孔隙结构以促进低分压下二氧化碳的捕获
DOI：
10.1016/j.carbon.2022.02.028
复制
发表时间：
2022
期刊：
影响因子：
10.9
通讯作者：
Liqing Li
中科院分区：
文献类型：
--
作者：
Baogen Liu;Xiancheng Ma;Da Wei;Yahui Yang;Zheng Zeng;Liqing Li
使用多孔固体吸附剂的二氧化碳（CO2）的物理吸附受到高温和低压的极大阻碍，导致在容量、选择性和动力学方面的捕获性能降低。在这里，我们报告了一种有效的合成三维分级多孔碳与超微孔-中孔互连的孔结构，能够提高CO2吸附在高温和低分压。这种独特的孔结构得益于在树脂前体中均匀引入碱金属（Li、Na、K）和其它金属（Mg、Ca、Zn）的组合。具体地，所采用的双金属原位活化方法允许产生具有3-5和7-9 nm范围内的孔径的广泛的中孔，而不牺牲超微结构的分布。这些特性使得动态CO2容量从1.36 mmol/g提高到1.54 mmol/g（40 °C和0.15 bar），CO2/N2选择性从73提高到85，以及先进的传质动力学。这项工作铺平了道路，在低分压下的高性能CO2吸附剂的发展，并提供了一种策略，以制备各种潜在的吸附应用的互连孔结构。
The physical adsorption of carbon dioxide (CO2) using porous solid adsorbent is greatly hindered by high temperature and low pressure, resulting in a decrease in capture performance in terms of capacity, selectivity, and kinetics. Here we report an effective synthesis of 3D hierarchical porous carbon with ultramicropore-mesopore interconnected pore architectures that are able to boost the CO2adsorption at elevated temperature and low partial pressure. This unique pore structure is benefit from the uniform introduction of a combination of alkali metals (Li, Na, K) and other metals (Mg, Ca, Zn) in the resin precursor. Specifically, the employed dual metal in-situ activation method allows generation of extensive mesopores with pore size in the range of 3–5 and 7–9 nm without sacrificing distribution of ultramicropore. These properties result in an enhanced dynamic CO2capacity from 1.36 to 1.54 mmol/g (40 °C and 0.15 bar), higher CO2/N2selectivity from 73 to 85 as well as advanced mass transport kinetics. This work paves the way for the development of high-performance CO2adsorbent at low partial pressure and provides a strategy to prepare interconnected pore architectures for a variety of potential adsorption application.