Removal of carbon dioxide from combustion gas by amine modified activated carbon

Large amount ofCO2 emissions from combustion of fossil fuels will lead to environmental crisis. One method for removing CO2 is adsorption by modified adsorbents. In this study, activated carbon modified by mono-ethanolamine was used for CO2 removal from exhaust gases of methane combustion. Activated carbon was modified with different amounts (25,50 and 75%) of monoethanol amine (MEA) by impregnation method. Amine modified activated carbon were used in filters and adsorption experiments were conducted to determine adsorption capacity by passing CO2 in different concentration (2000-5000 ppm), different flow rate (100 – 400 ml/min), and different temperatures (25, 50 and 75°C) individually. CO2 was analyzed by ND IR CO2 analyzer. Time to reach adsorption equilibrium of carbon dioxide on to modified activated carbon was 1.0 h. Carbon dioxide was not absorbed on virgin activated carbon. Maximum carbon dioxide adsorption capacity for AC-MEA50 was determined 13.0mg/g. By increasing temperature from 25 to 75°C, adsorption capacity was increased 25percent. Maximum CO2 adsorption capacity was achieved at gas flow rate of 100mL/min, and by increasing flow rate, capacity was decreased. By increasing amine loaded on modified activated carbon to 75 percent, CO2 adsorption capacity was decreased.By using amine modified activated carbon, it is possible to remove carbon dioxide from exhaust gases of methane combustion.