Abstract: A residue carbon is used as a catalyst for the catalytic oxidation of SO 2 in a packed-bed reactor.The influences of reaction temperature,space velocity, and inlet SO 2 concentration on the elimination efficiency for SO 2 is also investigated.A new technique for SO 2 removal is developed in the study,that is SO 2 removal by a partially wetted bed with deactivated carbon regenerated first by multistage bubbling and subsequently by drying.Theoretical analysis and experimental results of low concentration SO 2 oxidation over activated carbon coupled with partial liquid phase vaporization are presented.A dynamic model has been first developed for this combination of reaction with vaporization of liquid in the packed bed.The model reveals the interactions among the exothermic reaction,endothermic vaporization and partial internal wetting of activated carbon pellets.Reliability of the model is confirmed by experiments.Secondly,the effects of the two different operation modes and the states of the wetted catalysts on SO 2 oxidation are compared.The results demonstrate that the method has increased SO 2 removal efficiency and sulfuric acid concentration.SO 2 removal can be almost 100%,the concentration of by-product sulfuric acid can be greatly enhanced to as high as 34%(wt).