Two new methods for calculating pore size distribution

complete model-less method and modified micropore analysis method

have been developed. The complete pore size distributions of nine active carbons were calculated by the new methods. Nitrogen adsorption isotherms of nine samples were measured with Micromeritics 2500 Digsorb and ST-03 adsorption instrument. These isotherms were correlated by the Picketts equation and it was found that n values were in the range of 1.1-1.4. Since C values in Picketts equation were in the range of 100-300

standard isotherm n2 was chosen to analyze the complete pore size distribution. The main pore structure parameters

including total surface area

micropore area and volume

non-micropore surface area and volume and average micropore hydraulic radius

and the complete pore distributions of nine active carbon samples were obtained. Two ratios SR and VR were in the range of 0.9-1.1. The results indicated that samples Dx-09-1-1

7S and J involved only micropore and the rest

including two active carbon fibers and four BPL active carbons

involved considerable amount of non-micropore.