Bimetallic Gold-Palladium vapour derived catalysts: The role of structural features on their catalytic activity

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• 作者：Claudio Evangelisti^a ; ^{claudio@dcci.unipi.it} ; Eleonora Schiavi^b ; Laura Antonella Aronica^b ; Anna Maria Caporusso^b ; ^c ; Giovanni Vitulli^c ; Luca Bertinetti^d ; Gianmario Martra^d ; Antonella Balerna^e ; Settimio Mobilio^f
• 关键词：Au&ndash ; Pd catalysts ; Metal vapour synthesis ; TEM and EXAFS analyses ; Benzyl alcohol oxidation
• 刊名：Journal of Catalysis
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：286
• 期：Complete
• 页码：224-236
• 全文大小：2450 K

文摘

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 ¦Ã-alumina and titanium oxide supports. Transmission electron microscopy (TEM) analysis determined the nanoparticles dimensions (d_m = 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.