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AuPt Alloy on TiO 2 : A Selective and Durable Catalyst for l ‐Sorbose Oxidation to 2‐Keto‐Gulonic Acid
Author(s) -
ChanThaw Carine E.,
Chinchilla Lidia E.,
Campisi Sebastian,
Botton Gianluigi A.,
Prati Laura,
Dimitratos Nikolaos,
Villa Alberto
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201501202
Subject(s) - catalysis , chemistry , mordenite , selectivity , leaching (pedology) , inorganic chemistry , metal , alloy , nuclear chemistry , organic chemistry , zeolite , environmental science , soil science , soil water
Pt nanoparticles were prepared by a sol immobilization route, deposited on supports with different acid/base properties (MgO, activated carbon, TiO 2 , Al 2 O 3 , 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 (TiO 2 and H‐Mordenite) that were able to minimize the formation of C 1 /C 2 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.