Carbon dioxide adsorption and desorption study using bimetallic calcium oxide impregnated on iron (III) oxide

Abstract

Bimetal adsorbent system of calcium oxide impregnated on iron (III) oxide were evaluated as a potential source of basic sites for carbon dioxide CO2 capture. The adsorbents were prepared by impregnation method and calcined at various temperature of 200-600 °C. Several characterizations were carried out using XRD, BET and CO2-TPD analysis. The CaO loading increased the basicity of the adsorbent significantly enhance the CO2 chemisorption. Furthermore, it drastically reduced the desorption temperature to 310-490 °C. The sample namely CaO/Fe2O3200 that calcined at 200 °C was found to be most efficient. The CO2 adsorption capacity of the sample was contributed mostly by chemisorption at 81.29 mg CO2/g adsorbent compared to physisorption of 4.64 mg CO2/g adsorbent.