Reactions between SO2 and O2 plays an important role in the production of acid H2SO4. From this reaction SO3 is formed. It then combined with oleum sulphuric acid forming characteristics.This reaction is exothermic and reaction. It is affected by temperature, pressure and catalysts. When the temperature drops equilibrium will shift towards creating SO3 and vice versa. When the pressure increases, the balance is shifting toward creating SO3. In addition to speed response, V2O5 is used as a catalyst
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