Effect of Particle Size of the Activated Carbon Pellets on the Rate of Sulfur Dioxide Oxidationt

Abstract

In the previous paper, oxidation reaction of SO2 on activated carbon was found to proceed at a constant rate until the amount of SO2, accumulated in the form of H2SO4, reached 10 percent of the carbon, and the rate was found to be proportional to the SO2 concentration in gas phase when the concentration was less than 0.01%. The present paper deals with the influence of particle size of the carbon, namely, influence of SO2 diffusion in its pores upon the above rate of oxidation reaction.Using the apparent rate constant measured for each particle size of the carbon, the effectiveness factor of the particle and the effective overall diffusion coefficient of SO2 were determined. Influence of concentration of 02 or H2O on the intrinsic reaction rate constant was also determined at various temperatures.As a result, it was shown that the reaction rate for any particle size and for various concentrations of each gas at a certain temperature would be estimated, if the properties of the activated carbon, i. e., pore volume and pore size distribution, were known and the intrinsic reaction rate was measured at this temperature. t Adsorption of Sulfur Dioxide on Activated Carbon in Flue Gas Desulfurization Process. IV.