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The contact process is named for the method by which sulfur dioxide (SO₂) is converted into sulfur trioxide (SO₃) through contact with a catalyst, typically vanadium(V) oxide (V₂O₅). This process involves the direct interaction or "contact" of the reactants in the presence of heat and the catalyst under controlled conditions. The efficiency and speed of this process, compared to earlier methods, led to its adoption in industrial sulfuric acid production, hence the name.

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