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Reference.org
Adams' catalyst
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<p>Adams' catalyst, also known as platinum dioxide, is usually represented as <a href="/facts/Platinum/qJC6lQf7">platinum</a>(IV) <a href="/facts/Oxide/DXtoVe1C">oxide</a> <a href="/facts/Water_of_crystallization/sbaKJNJX">hydrate</a>, PtO2•H2O. It is a catalyst for <a href="/facts/Hydrogenation/l7EzNSA7">hydrogenation</a> and <a href="/facts/Hydrogenolysis/v8VT0Bx2">hydrogenolysis</a> in <a href="/facts/Organic_synthesis/aprl6Iq7">organic synthesis</a>. This dark brown powder is commercially available. The oxide itself is not an active catalyst, but it becomes active after exposure to hydrogen whereupon it converts to <a href="/facts/Platinum_black/DFoW24bQ">platinum black</a>, which is responsible for reactions. </p>