Abstract
The effect of impregnation of activated carbon with Cr 2O and Fe 2O 3 and promotion by Zn 2+ on its adsorptive properties of carbon dioxide was studied using a volumetric adsorption apparatus at ambient temperature and low pressures. Slurry and solution impregnation methods were used to compare CO 2 capture capacity of the impregnated activated carbon promoted by Zinc. The obtained adsorption isotherms showed that amount of CO 2 adsorbed on the samples impregnated by Cr 2O was increased about 20% in compare to raw activated carbon. The results also showed that Fe 2O 3 was not an effective impregnating species for activated carbon modification. Moreover slurry impregnation method showed higher CO 2 adsorption capacity in comparison with solution impregnation method. Samples prepared by co-impregnation of two metal species showed more adsorption capacity than samples impregnated by just one metal species individually. Washing the impregnated samples by metal oxide resulted in 15% increase in CO 2 adsorption capacities of activated carbons which can be attributed to the metal oxides removal covering the adsorption surface. Decreasing impregnation temperature from 95 to 25 °C in solution method showed a significant increase in CO 2 adsorption capacity. Sips equation was found a suitable model fitting to the adsorption data in the range studied.
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