AuPt Alloy on TiO2: A Selective and Durable Catalyst for l‐Sorbose Oxidation to 2‐Keto‐Gulonic Acid
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AbstractPt nanoparticles were prepared by a sol immobilization route, deposited on supports with different acid/base properties (MgO, activated carbon, TiO2, Al2O3, H‐Mordenite), and tested in the selective oxidation of sorbose to 2‐keto‐gulonic acid (2‐KGUA), an important precursor for vitamin C. In general, as the basicity of the support increased, a higher catalytic activity occurred. However, in most cases, a strong deactivation was observed. The best selectivity to 2‐KGUA was observed with acidic supports (TiO2 and H‐Mordenite) that were able to minimize the formation of C1/C2 products. We also demonstrated that, by alloying Pt to Au, it is possible to enhance significantly the selectivity of Pt‐based catalysts. Moreover, the AuPt catalyst, unlike monometallic Pt, showed good stability in recycling because of the prevention of metal leaching during the reaction.
