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EnglishA procedure to synthesize new Au–Pd bimetallic catalysts using Au and Pd vapours as reagents (metal vapour synthesis, MVS) is reported. The simultaneous co-condensation of Au and Pd vapours with acetone vapour affords Au–Pd/acetone-solvated metal atoms which have been used to deposit Au–Pd bimetallic nanoparticles on γ-alumina and titanium oxide supports. Transmission electron microscopy (TEM) analysis determined the nanoparticles dimensions (dm = 2.2–2.4 nm) and size distribution while the X-ray absorption spectroscopy (XAS) analysis showed the presence of small bimetallic Au–Pd nanoparticles with a large amount of Au–Pd bonds. The bimetallic co-condensed systems, tested in the selective oxidation of benzyl alcohol with molecular oxygen both in toluene solvent and in solvent-free conditions, showed higher catalytic activity and selectivity than the corresponding monometallic systems as well as of the analogous systems obtained by separate evaporation of the two metals.
| Autori interni: | |
| Autori: | Evangelisti, C.; Schiavi, E.; Aronica, LAURA ANTONELLA; Caporusso, ANNA MARIA; Vitulli, G; Bertinetti, L.; Martra, G.; Balerna, A.; Mobilio, S. |
| Titolo: | Bimetallic Gold–Palladium vapour derived catalysts: The role of structural features on their catalytic activity |
| Anno del prodotto: | 2012 |
| Abstract: | A procedure to synthesize new Au–Pd bimetallic catalysts using Au and Pd vapours as reagents (metal vapour synthesis, MVS) is reported. The simultaneous co-condensation of Au and Pd vapours with acetone vapour affords Au–Pd/acetone-solvated metal atoms which have been used to deposit Au–Pd bimetallic nanoparticles on γ-alumina and titanium oxide supports. Transmission electron microscopy (TEM) analysis determined the nanoparticles dimensions (dm = 2.2–2.4 nm) and size distribution while the X-ray absorption spectroscopy (XAS) analysis showed the presence of small bimetallic Au–Pd nanoparticles with a large amount of Au–Pd bonds. The bimetallic co-condensed systems, tested in the selective oxidation of benzyl alcohol with molecular oxygen both in toluene solvent and in solvent-free conditions, showed higher catalytic activity and selectivity than the corresponding monometallic systems as well as of the analogous systems obtained by separate evaporation of the two metals. |
| Digital Object Identifier (DOI): | 10.1016/j.jcat.2011.11.007 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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