Nonaqueous Heterogeneous Oxidation of Sulfur Dioxide

Article abstract of DOI:10.1021/j100371a008

The nonaqueous oxidation of SO2 on various solid catalysts was investigated in the presence of oxygen and ozone.The amount of product formed was investigated as a function of catalyst mass and the duration of experiment.For alumina catalysts a surface saturation value of approximately 0.5 mg of SO4^2-/m² of alumina was found for a variety of different aluminas independent of surface area, surface pH, and water content.This result corresponds to a monolayer of SO4^2- if a surface area of 0.3 nm²/SO4^2- is assumed.For an activated carbon catalyst a surface saturation value of 0.25 mg of SO4^2-/m² of carbon was found under wet nonaqueous conditions.For the activated carbon catalysts, unlike the alumina catalysts, the presence of at least a few layers of readily desorbable water is a significant variable for the oxidation of sulfur dioxide.