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• W3199610364 endingPage "111783" @default.
• W3199610364 startingPage "111783" @default.
• W3199610364 abstract "Aiming at examining the effect of the coverage of modulated Au(Pd) atoms over bimetallic Pd-Au catalysts on the catalytic performance for direct oxidative esterification of methacrolein with methanol to methyl methacrylate. Here, two kinds of surface composition with different coverage of modulated Au(Pd) atoms on Au modulated Pd (AuPd) and Pd modulated Au (PdAu) catalysts have been designed and employed to investigate direct oxidative esterification using density functional theory calculation. The results showed that Pd modulated Au catalysts with higher coverage of modulated Pd atoms in the presence of pre-adsorbed O exhibited higher stability for resistance toward deactivation induced by H2O deposition than Au modulated Pd and pure Au(Pd) catalysts. The formation of CH3O species mainly came from pre-adsorbed O assisted CH3OH activation rather than the direct breakage of CH3OH via O-H bond, and it was more advantageous than the activation of CH3OH via C-H bond with and without pre-adsorbed O. Additionally, Pd modulated Au catalysts with higher coverage of modulated Pd atoms improved the activity for MMA formation via MAL+*→CH2C(CH3)CO+(H)+CH3O+*→MMA than Au modulated Pd and pure Au(Pd) catalysts. Moreover, the better catalytic performance (stability and activity) for direct oxidation esterification of Pd modulated Au catalysts with higher coverage of modulated Pd atoms were attributed to less average charge of surfaces atoms and the d-band center close to the Fermi level compared with pure Au(Pd) and Au modulated Pd catalysts. Therefore, it is proposed that Pd modulated Au catalysts are promising for direct oxidative esterification reaction of methacrolein with methanol to methyl methacrylate. This study not only helps understanding theory on direct oxidative esterification mechanism on bimetallic Pd-Au catalysts, but also provides clues for the design of high-effectively bimetallic Pd-Au catalysts for direct oxidative esterification." @default.
• W3199610364 created "2021-09-27" @default.
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• W3199610364 date "2021-09-01" @default.
• W3199610364 modified "2023-10-05" @default.
• W3199610364 title "Effect of the coverage of modulated Au(Pd) atoms over bimetallic Pd-Au catalysts on catalytic performance for direct oxidative esterification of methacrolein into methyl methacrylate" @default.
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• W3199610364 doi "https://doi.org/10.1016/j.mcat.2021.111783" @default.
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