Adsorption Performance Of CO₂ On Spherical Activated Carbon

Global warming resulting in more and more climate disasters, the discussion about "energy saving and CO2 emission reduction, especially the CO2 capture, sequestration (CCS)" has become a hotspot in scientific community. It is obviously an efficient way to reduce CO2 emissions by captive CO2 in flue-gases due to 60% of total CO2 coming from coal-fired power plants.The relationships between the pore structure parameter of spherical activated carbons (PSACs) and adsorption capacity of CO2 were investigated as well as the selectively adsorption of CO2. The results indicated that.1) PSACs with BET surface area of 1005 m2/g has a adsorption capability of 0.91 mmol/g at 25℃and atmospheric pressure. When 5% melamine was coated on the surface of PSACs, the equilibrium adsorption amount of CO2 increased 26.3%, about 1.15mmol/g.2) There is a linear relationship between the equilibrium adsorption amount of CO2 and the specific surface area of micropores with pore size lower than 1 nm.3) PSAC had high adsorption selectivity for CO2 in N2/O2 gases. There is little effect of H2O on the adsorption performance of CO2 on PSACs if a certain of moisture existing in the stimulation flue-gases.4) Materials studio software was applied to simulate the adsorption and diffusion behavior of CO2 and N2 in micropores to investigate the selective adsorption mechanism. The main reason for the adsorption selectivity existence was the difference of London dispersion forces between the gas molecules and absorbent.