Stability of Polyamine Based Adsorbents to Gas Impurities for CO₂ Capture

Abstract

Amine based adsorbents are promising options for CO₂ removal from industrial exhaust streams because they offer low regeneration energy and high CO₂ capture performance. Tetraethylenepentamine (TEPA) is one of the most common commercial polyamines that has been used as a prototypical amine to develop effective amine based adsorbents for CO₂ capture. For the viability of carbon capture based on amine adsorbents, the durability of amine sites during practical applications is an important criterion. This work focused on the stability of TEPA based materials under accelerated oxidizing conditions in the presence of O₂, SO₂, NO₂, water vapor, and simulated flue gas. It was found that the presence of gas impurities caused a marked loss of the CO₂ adsorption capacity of the adsorbents. The presence of water vapor and CO₂ suppressed oxidative degradation of the adsorbents.