AuPt Alloy on TiO2: A Selective and Durable Catalyst forl-Sorbose Oxidation to 2-Keto-Gulonic Acid Academic Article uri icon

  • Overview
  • Research
  • Identity
  • Additional Document Info
  • View All


  • Pt 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.


  • Chan-Thaw, Carine E
  • Chinchilla, Lidia E
  • Campisi, Sebastian
  • Botton, Gianluigi
  • Prati, Laura
  • Dimitratos, Nikolaos
  • Villa, Alberto

publication date

  • December 2015