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• W2046122984 abstract "A series of Au/ZrO2 catalysts with low content of gold (<1 wt.%) were prepared by deposition–precipitation method and evaluated in the low-temperature water–gas shift reaction (WGSR) under H2-rich reformate atmosphere. The effect of pre-calcination temperature of ZrO2 on the structural and surface properties of the freshly reduced Au/ZrO2 catalysts was investigated by XRD, N2-physisorption, HRTEM, UV–Vis DRS, AAS, EPR and XPS characterizations. The catalytic evaluation results reveal that the one supported on ZrO2 calcined at 350 °C shows the best catalytic performance. Correlating to the characterization results, it is found that the catalytic performance of Au/ZrO2 catalysts strongly depends on the concentration of F-center defects on ZrO2 surface. EPR and XPS results disclose that electrons can be transferred from F-center to the supported Au, resulting in the formation of activated electron-rich Au cluster, which is responsible for the high catalytic activity of the Au/ZrO2 catalysts. Moreover, the electron transfer leads to the firm anchoring of Au cluster by the F-center, thus favoring a high catalytic stability. It is proposed that the active site for WGSR on the Au/ZrO2 catalysts can be expressed as Auδ−[Vo−]Zr3+, where [Vo−] represents an F-center." @default.
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• W2046122984 date "2012-09-01" @default.
• W2046122984 modified "2023-10-15" @default.
• W2046122984 title "Highly efficient Au/ZrO2 catalysts for low-temperature water–gas shift reaction: Effect of pre-calcination temperature of ZrO2" @default.
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• W2046122984 doi "https://doi.org/10.1016/j.ijhydene.2012.06.025" @default.
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