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• W2508338082 abstract "Highly active and stable bimetallic Au–Pd catalysts have been extensively studied for several liquid-phase oxidation reactions in recent years, but there are far fewer reports on the use of these catalysts for low-temperature gas-phase reactions. Here we initially established the presence of a synergistic effect in a range of bimetallic Au–Pd/CeZrO4 catalysts, by measuring their activity for selective oxidation of benzyl alcohol. The catalysts were then evaluated for low-temperature WGS, CO oxidation, and formic acid decomposition, all of which are believed to be mechanistically related. A strong anti-synergy between Au and Pd was observed for these reactions, whereby the introduction of Pd to a monometallic Au catalyst resulted in a significant decrease in catalytic activity. Furthermore, monometallic Pd was more active than Pd-rich bimetallic catalysts. The nature of the anti-synergy was probed by several ex situ techniques, which all indicated a growth in metal nanoparticle size with Pd addition. However, the most definitive information was provided by in situ CO-DRIFTS, in which CO adsorption associated with interfacial sites was found to vary with the molar ratio of the metals and could be correlated with the catalytic activity of each reaction. As a similar correlation was observed between activity and the presence of Au0* (as detected by XPS), it is proposed that peripheral Au0* species form part of the active centers in the most active catalysts for the three gas-phase reactions. In contrast, the active sites for the selective oxidation of benzyl alcohol are generally thought to be electronically modified gold atoms at the surface of the nanoparticles." @default.
• W2508338082 created "2016-09-16" @default.
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• W2508338082 date "2016-09-07" @default.
• W2508338082 modified "2023-09-26" @default.
• W2508338082 title "Synergy and Anti-Synergy between Palladium and Gold in Nanoparticles Dispersed on a Reducible Support" @default.
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• W2508338082 doi "https://doi.org/10.1021/acscatal.6b01275" @default.
• W2508338082 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5154324" @default.
• W2508338082 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27990317" @default.
• W2508338082 hasPublicationYear "2016" @default.
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