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Contact process
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<p>The contact process is a method of producing <a href="/facts/Sulfuric_acid/Wom6fymJ">sulfuric acid</a> in the high concentrations needed for industrial processes. <a href="/facts/Platinum/qJC6lQf7">Platinum</a> was originally used as the <a href="/facts/Catalyst/LPBS7TQC">catalyst</a> for this reaction; however, because it is susceptible to reacting with <a href="/facts/Arsenic/k1c4f44D">arsenic</a> impurities in the sulfur feedstock, <a href="/facts/Vanadium(V)_oxide/LPtvz4pq">vanadium(V) oxide</a> (V2O5) has since been preferred. </p>