树脂基固态胺吸附材料的选择性CO2吸附性能

基于简单的湿浸渍法将聚乙烯亚胺(PEI)有效负载到多孔树脂(HP20)中,制备获得树脂基固态胺吸附材料,并探究了PEI负载量(30%~60%)、吸附温度(30~90℃)和压力(2~100kPa)对材料CO₂吸附性能的影响.研究表明树脂基固态胺吸附材料的最佳PEI负载量为50%,过量的PEI会致使材料CO₂吸附容量和胺基利用效率的显著降低.所筛选的材料在较低或较高的CO₂分压范围内均能展现出优异的CO₂吸附性能,在30℃下的CO₂吸附容量达到3.06~3.78mmol/g,表明该材料在不同CO₂分压的多种碳捕集应用中均有着较好的适用性.此外,树脂基固态胺吸附材料的CO₂/CH₄和CO₂/N₂选择性在2~100kPa的压力范围内分别有262~5858和708~11551,在各类传统或新兴的固体吸附材料中处于较高水平.

Selective CO2 adsorption performance of resin - based solid amine adsorbents

In this work, resin-based solid amine adsorbents were obtained by effectively functionalizing polyethyleneimine (PEI) into porous resin (HP20) using a simple wet impregnation method. The effects of PEI loading (30%~60%), adsorption temperature (30~90℃) and pressure (2~100kPa) on the CO₂ adsorption performance of the adsorbents were investigated. It was shown that the optimum PEI loading for the adsorbents was 50%, and that excess PEI resulted in a significant decrease in CO₂ adsorption capacity and amine utilization efficiency. The screened adsorbents exhibited excellent CO₂ adsorption performance at both low and high CO₂ partial pressures, with CO₂ adsorption capacities ranging from 3.06 to 3.78mmol/g at 30℃, indicating that resin-based solid amine adsorbents were suitable for different CO₂ capture applications at various CO₂ partial pressures. In addition, the CO₂/CH₄ and CO₂/N₂ selectivity of resin-based solid amine adsorbents ranged from 262 to 5858 and from 708 to 11551 at 2~100kPa, respectively, which were at a high level among various traditional and emerging solid adsorbents.