Atmospheric Particulate Matter And So <sub> 2 </ Sub> Of Multiphase Reactions

Atmospheric aerosols play a significant role in atmospheric chemical reactions. They provide a surface with reactive sites on which the heterogeneous conversion of various atmospheric chemical species could occur. In this thesis, the heterogeneous reactions of SO₂ with oxides, atmospheric particles and mixtures were studied in the presence of oxygen. The long optical path cell with variable-path length was used for such reactions, and In situ FTIR and X-ray photoelectron spectroscopy (XPS) were used to identify the products of the reactions. In addition, the crystal phases and the surface properties of the samples were characterized by XRD patterns and BET specific surface area.The major results are addressed as following:1. On the condition of O₂ introduction, some certain oxides, such as CaO, Portland cement, smelting dust and building dust, have the catalytic oxidation activity for SO₂. SO₃ and SO₄^2- are the main products.2. The other oxides, such as road dust and soil sample, have no catalytic oxidation activity.3. The order of catalytic activities of atmospheric particles and oxides selected is Portland cement > mixture B1 > CaO > building dust > mixture A1 > smelting dust.4. In the presence of oxygen, the reactivity of SO₂ on the surface of dust is basically a first order reaction with respect of SO₂.5. It was suggested that the surface-coordinated sulfite, bisulfite and sulfate formed...