The capacities to
adsorb CO2 of the different activated carbons were compared with both the micropore volumes as established
by N2 adsorption, and the ultramicropore volumes as established by CO2 adsorption. The ultramicropore
volume is of crucial importance for the capture of CO2 from flue gas. PAC from HTC grass cuttings
and from horse manure had the largest ultramicropore volumes.