The following reactions illustrate the general chemical principles involved in wet sulfuric acid production and sulfur-containing gas treatment. Actual industrial process configuration, catalyst selection, equipment design, operating conditions, and emission-control requirements depend on the specific project. Process Principle:
H₂S(g) + 1.5O₂(g) → SO₂(g) + H₂O(g) + 518 kJ/mol
SO₂(g) + 0.5O₂(g) → SO₃(g) + 99 kJ/mol
SO₃(g) + H₂O(g) → H₂SO₄(g) + 101 kJ/mol
H₂SO₄(g) → H₂SO₄(aq) + 69 kJ/mol
NOₓ(g) + NH₃(g) → N₂(g) + H₂O(g)
SO₂(g) + H₂O₂(aq) → H₂SO₄(aq) + 306 kJ/mol