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- W4385490073 abstract "Abstract Understanding the atomistic structure of the active site during catalytic reactions is of paramount importance in both fundamental studies and practical applications, but such studies are challenging due to the complexity of heterogeneous systems. Using Pt/CeO 2 as an example, we reveal the dynamic nature of active sites during the water-gas-shift reaction (WGSR) by combining multiple in situ characterization tools to study well-defined CeO 2 nanoshapes with different exposed facets. We show that metallic Pt is present on the CeO 2 (111) surfaces, while oxidized Pt species are dominant on CeO 2 (110) and (100) surfaces after O 2 –H 2 pretreatment. The different concentrations of interfacial Pt δ+ – O – Ce 4+ moieties at Pt/CeO 2 interfaces are responsible for the rank of catalytic performance of Pt/CeO 2 catalysts: Pt/CeO 2 -rod > Pt/CeO 2 -cube > Pt/CeO 2 -oct. For all the catalysts, metallic Pt is formed during the WGSR, leading to the transformation of the active sites to Pt 0 – O v – Ce 3+ and interface reconstruction. These findings shed light on the nature of the active site for the WGSR on Pt/CeO 2 and highlight the importance of combining complementary in situ techniques for establishing structure-performance relationships." @default.
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- W4385490073 date "2023-08-02" @default.
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- W4385490073 title "Nature of active sites at Pt/CeO2 interfaces for the water-gas-shift reaction" @default.
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- W4385490073 doi "https://doi.org/10.21203/rs.3.rs-3164975/v1" @default.
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