Effect of adsorption and desorption CO 2 on micro-structures of activated carbon

The adsorption and desorption properties of carbon dioxide(CO2) on six activated carbons were investigated at 0,15,25,38 ℃ in an atmospheric dynamic adsorption reactor. The adsorbents were characterized by CO2 and N2 ad- sorption isotherms,FT-IR analysis and Boehm titration. The results show that micropore volume of activated carbons is an important factor to characterize the adsorption performance of CO 2 ,the pore size distribution in the range of 0. 5- 1. 0 nm or 2. 0-4. 5 nm trend to enhance the adsorption of CO2. The rate of adsorption or desorption increases with the increase of temperature. The adsorption capacity of CO2 increases with an increase of carboxyl and hydroxy groups on activated carbons. However,the increase of carbonyl groups would reduce the desorption capacity of CO 2 .