High-pressure CO2 adsorption on a polymer-derived carbon molecular sieve

CO2 sorption isotherms were measured on a polymer-derived carbon molecular sieve (CMS) at three temperatures and pressures up to 40 atm using the gravimetric method. The adsorption and desorption data were fitted to the Langmuir and Toth isotherms. Low-pressure CO2 isotherms were also measured on a standard pore and surface analyzer (PSA) rig. Strong surface barriers were found at low sorption pressure, but micropore hysteresis was not seen at high sorption pressure.