| 초록 |
Alumina was used for PEI (polyethylenimine) impregnation to make hybrid materials for CO2 adsorption. The textural properties of the prepared materials before and after the impregnation were examined by XRD, N2 adsorption-desorption isotherms and TG/TGA. CO2 adsorption/desorption measurements were carried out using a TGA unit connected to a flow panel using high purity CO2 gas. The alumina alone exhibited a moderate adsorption capacity at 25 oC. After PEI impregnation, CO2 adsorption capacity increased with the increasing of the amine loading levels until too much PEI coated on the external surface. On the scale of the amount of CO2 adsorbed per gram PEI, the hybrid material demonstrated much higher CO2 adsorption capacity than pure PEI, thus reflecting a significant synergetic enhancement in CO2 adsorption capacity when PEI is distributed inside the mesoporous material. All these hybrid samples exhibited highly stable cyclic adsorption-desorption performance without losing their capturing capacities. |
