High temperature modification on activated carbons and adsorption kinetics of perfluoroisobutene(PFIB) on carbon bed

The high temperature modifications (400-800 degrees C) were carried out on granular activated carbons in the N-2 flow and the adsorption behavior of PFIB on the carbon bed under various airflow humidity were studied. The breakthrough curves were processed through Wheeler equation and the dynamic model based on the linear equilibrium was used to correlate the experimental data. The results show that the pore structure didn't change obviously and the surface oxygen amount decreased with the increase of modification temperature; the selective adsorption capacities to PFIB increased greatly and the carbon bed's effective protection time to PFIB prolonged under high humidity of airflow. The theoretical breakthrough curves are in agreement with the experimental data very well, and this dynamic model can be used to predict the breakthrough behavior and to design and select the parameters of the cartridge canister.