A STUDY ON THE APPARENT KINETICS OF H2S REMOVAL USING A ZNO-MNO DESULFURIZER

The apparent kinetics of H2S removal by a ZnO-MnO desulfurizer were st udied by thermogravimetric analysis. The experimental results show tha t the reaction is first order with respect to H2S concentration. In th e temperature range 200-400 degrees C, the rate was controlled, at low er temperatures, by the grain surface reaction rate and, at higher tem peratures, by the rate of intrapellet diffusion, respectively. The app arent kinetic behavior could be modeled by the equivalent grain model. The activation energies of surface reaction and solid diffusion were determined to be 11.842 and 20.865 kJ/mol, respectively. An optimum re action temperature was observed. Reasons for this and why the solid di ffusion activation energy exceeded that of the surface reaction are pr oposed.