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Question
With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process.
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Solution
Formation of sulphur dioxide :
S + O2 → SO2
Conversion of SO2 to SO3
\[\ce{2SO2 + O2 ⇌[V2O3][400-450°C] 2SO3}\]
Conversion of sulphur trioxide to oleum:
SO3 + H2SO4 → H2S2O7
Dilution of oleum:
H2S2O7 + H2O → 2H2SO4
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