Ritmongkolpun P., Rangsunvigit P., Kulprathipanja S., 2014, Effects of Different Polyethyleneimine Molecular Weights on CO2 Adsorption on Activated Carbon, Chemical Engineering Transactions, 39, 259-264.
Effects of different polyethyleneimine (PEI) molecular weights on CO2 adsorption on activated carbon (AC) were investigated. The PEI loading was varied using different PEI initial concentrations from 1 to 5 g/L. CO2 adsorption isotherms were investigated at 30 and 75 °C. Adsorbents were characterized by TG-DTA, FTIR, and surface area and pore size analysis. The results showed that PEI impregnated on activated carbon improved the CO2 adsorption capacity due to the synergistic effects between physical and chemical adsorption. AC impregnated with low molecular weight PEI showed improvement in the CO2 adsorption capacity at a low temperature. Higher PEI molecular weights showed higher adsorption capacity at a high temperature. An optimum amount of PEI loading and appropriate PEI molecular weight are needed to increase the CO2 adsorption capacity.
