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AuPt alloy on TiO2: a selective and durable catalyst for L-sorbose oxidation to 2-keto-gulonic acid

Chan-Thaw, Carine E., Chinchilla, Lidia E., Campisi, Sebastian, Botton, Gianluigi A., Prati, Laura, Dimitratos, Nikolaos and Villa, Alberta 2015. AuPt alloy on TiO2: a selective and durable catalyst for L-sorbose oxidation to 2-keto-gulonic acid. ChemSusChem 8 (24) , pp. 4189-4194. 10.1002/cssc.201501202

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Wiley-Blackwell
ISSN: 1864-5631
Last Modified: 04 Jun 2017 08:40
URI: http://orca.cf.ac.uk/id/eprint/82555

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