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 vitaminC. 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.
AuPt Alloy on TiO2 : a Selective and Durable Catalyst for L-Sorbose Oxidation to 2-Keto-Gulonic Acid / C.E. Chan-Thaw, L.E. Chinchilla, S. Campisi, G.A. Botton, L. Prati, N. Dimitratos, A. Villa. - In: CHEMSUSCHEM. - ISSN 1864-5631. - 8:24(2015 Dec 21), pp. 4189-4194. [10.1002/cssc.201501202]
AuPt Alloy on TiO2 : a Selective and Durable Catalyst for L-Sorbose Oxidation to 2-Keto-Gulonic Acid
C.E. Chan-ThawPrimo
;S. Campisi;L. Prati;A. Villa
2015
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 vitaminC. 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.File | Dimensione | Formato | |
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