Introduction of cross-linking agents to enhance the performance and chemical stability of polyethyleneimine-impregnated CO2 adsorbents: Effect of different alkyl chain lengths

Polyethyleneimine (PEI)-functionalized silica-based CO2 adsorbents are well known to irreversibly form urea during the regeneration process at high temperatures and under CO2-rich atmospheric conditions. The formation of urea is a critical drawback that substantially reduces the cyclic performance of PEI-functionalized adsorbents. In this study, epoxy cross-linkers were introduced to PEI to suppress the formation of urea. Pristine PEI and epoxy...