CO2 adsorption on metal organic frameworks, MIL-96 and MIL-53

Metal organic frameworks (MOFs), MIL-53 and MIL-96, were prepared, characterized and tested for CO2 adsorption in static and dynamic conditions. These MOFs exhibit different characteristics. BET surface areas are 1519 and 687 m2/g for MIL-53 and MIL-96, respectively. Also they display different thermal stability; MIL-53 has the higher stability up to 773K, whereas, MIL-96 shows low thermal stability up to 570K. From adsorption isotherm tests, MIL-53 presents CO2 adsorption capacity of 56 and 64 cc/g at 1 atm, 296 and 273K, respectively, and heat of adsorption was found to be 39 kJ/mol. MIL-96 exhibits CO2 adsorption capacity of 124 cc/g at standard conditions with the heat of adsorption of 28.6 kJ/mol. Dynamic adsorption experiments, however, show that MIL-53 has CO2 adsorption of 169 cc/g at 1 bar and room temperature (304 K). However, MIL-96 demonstrates adsorption capacity of 98.2 cc/g at 1 bar and 298K. MIL-53 presents higher working capacity due to its larger pore size.