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• W2592963169 endingPage "2606" @default.
• W2592963169 startingPage "2597" @default.
• W2592963169 abstract "Pt–Re clusters supported on titania have shown promise as catalysts for the low temperature water–gas shift reaction. However, the enhanced activity of the bimetallic Pt–Re catalyst versus pure Pt is not well understood. In this work, exclusively bimetallic clusters were grown on TiO2(110) by vapor-deposition of Pt on 2 ML Re clusters and Re on 2 ML Pt clusters. Temperature programmed desorption experiments with CO were used to determine the concentration of Re at the surface, given that CO dissociates on Re but not on Pt. Deposition of 2 ML Pt on 2 ML Re resulted in Re core–Pt shell structures, whereas deposition of low coverages (<0.5 ML) of Re on 2 ML Pt resulted in complete diffusion of Re into the Pt clusters. Both of these Pt on Re bimetallic clusters are thermodynamically favored by the lower surface free energy of Pt compared to Re, and both are also more active than pure Pt clusters in the WGS reaction. Postreaction XPS experiments indicate that Re in the Pt on Re clusters is not oxidized under WGS conditions (130–190 °C). Furthermore, preoxidized Pt–Re clusters exhibit lower activity than both pure Pt and the unoxidized Pt–Re clusters, demonstrating that ReOx does not provide active sites in the WGS reaction. Density functional theory calculations show that CO binds less strongly to the Pt on Re surface alloy compared to pure Pt, and infrared absorption–reflection spectroscopy studies on a Pt–Re surface alloy confirm that the coverage of CO after WGS reaction is lower on the Pt–Re alloy surface. Thus, decreased CO poisoning on Pt–Re could explain the higher WGS activity of the bimetallic clusters." @default.
• W2592963169 created "2017-03-16" @default.
• W2592963169 creator A5001640549 @default.
• W2592963169 creator A5015999553 @default.
• W2592963169 creator A5033774213 @default.
• W2592963169 creator A5036024182 @default.
• W2592963169 creator A5061649783 @default.
• W2592963169 creator A5063674208 @default.
• W2592963169 creator A5078478231 @default.
• W2592963169 creator A5086443456 @default.
• W2592963169 date "2017-03-15" @default.
• W2592963169 modified "2023-09-26" @default.
• W2592963169 title "Understanding Active Sites in the Water–Gas Shift Reaction for Pt–Re Catalysts on Titania" @default.
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