Platinum catalysts
C&CS #1394 – Platinum catalyst for SO2 oxidation
This platinum catalyst for the oxidation of SO₂ to SO₃ in the sulfuric acid production process represents a novel and environmentally friendly solution.The platinum-based washcoat
Sulfuric acid is predominantly produced using the contact process, a well-established industrial process. First, sulfur dioxide (SO₂) is obtained, usually through the combustion of sulfur or the thermal decomposition of sulfur-containing byproducts. This is followed by the oxidation of sulfur dioxide to sulfur trioxide (SO₃) in the presence of a platinum- or vanadium-based catalyst at elevated temperature.
To achieve a high yield, the reaction is carried out in multiple stages with precise temperature control. Modern washcoat catalysts, such as those developed by P&P Industries, increase the efficiency and reliability of the conversion.
The resulting SO₃ does not react directly with water, as this would produce fine sulfuric acid mist. Instead, it is absorbed into concentrated sulfuric acid, forming oleum (fuming sulfuric acid). Dilution with water finally yields the desired sulfuric acid concentration.
The sustainability of the process is enhanced by regeneration: Spent sulfuric acid is thermally decomposed, with SO₂ being recovered and fed back into the process. This creates a closed loop that conserves resources and reduces emissions.
This platinum catalyst for the oxidation of SO₂ to SO₃ in the sulfuric acid production process represents a novel and environmentally friendly solution.The platinum-based washcoat
