Additives enhancing supported amines performance in CO₂ capture from air

The utilization of supported amines as adsorbents in direct air capture (DAC) has been demonstrated to be a promising strategy for the reduction CO2 emissions. To improve performance amine-based adsorbents, incorporation additives widely adopted. In present study, we conduct comprehensive comparison seven on tetraethylenepentamine-impregnated mesoporous silica representative adsorbent. results indicate that minor molecular weight with hydroxyl groups show improved adsorption–desorption and increase oxidative stability. A proposed mechanism these improvements is combined physical chemical promotion effects groups. Through review existing literature, it found are dependent factors, such additive type, pristine adsorbent properties, method, testing conditions. Based findings, recommended future DAC systems prioritize use hydroxyl-containing additives, whereas higher concentration temperature may benefit from without These conclusions expected contribute design efficient capture.