II. The Role of Heterogeneous Vanadium Oxide Catalysts in the Contact Process A. Overview of the heterogeneous catalytic mechanism of V₂O₅ in the oxidation of SO₂ to SO₃.

II. The Role of Heterogeneous Vanadium Oxide Catalysts in the Contact Process* A. Overview of the heterogeneous catalytic mechanism of V2O5 in the oxidation of SO2 to SO3.* 1. Adsorption and activation of reactants on the solid catalyst surface.* 2. Redox cycle of vanadium (V4+/V5+) within the solid catalyst.* 3. Desorption of the product from the solid catalyst surface.* B. Different forms and supports of heterogeneous vanadium oxide catalysts used in the Contact Process.* 1. Fused catalysts (e.g., V2O5/K2O/SiO2 – a solid phase).* 2. Supported catalysts (e.g., V2O5 on TiO2, Al2O3 – solid phases).* 3. Influence of promoters (e.g., alkali metals, other transition metal oxides) within the solid catalyst matrix.

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