Kinetics of inhibition reaction to coke deterioration by Benzene pyrolysis carbons

The kinetics data of inhibition reaction to coke deterioration by benzene pyrolysis carbons were obtained to establish the models of the reaction and to determine model parameters using unreacted shrinking reaction core model.According to the kinetics models,the relative resistances of external diffusion ηg/∑η,the relative resistances of internal diffusion ηD/∑η,and the relative resistance of surface chemical reaction ηC/∑η,were calculated.The results show that based on Arrhenius equation,the activation energy Ea=217.0 kJ/mol and the effective diffusion activation energy ED=162.9 kJ/mol of the inhibition reaction of coke samples infiltrated by benzene pyrolysis carbons are both higher than those of the blank coke samples,Ea=142.0 kJ/mol and ED=96.30 kJ/mol,respectively.The inhibition reaction to deterioration is mainly affected by surface chemical reaction and external diffusion at the beginning of the reaction and then by internal diffusion,external diffusion and surface chemical reaction simultaneously.In addition,the inhibition reaction to deterioration is affected by the surface chemical reaction at the lower reaction temperatures,and then ηC/∑η decreases with the increase of the reaction temperatures.