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• W2106345900 abstract "In this study, the adsorption and the reactive properties of α-β-unsaturated aldehydes are studied by means of density functional calculations (DFT) on two well-defined PtSn alloy surfaces, p(2×2) Pt3Sn(111) and (3×3)R30° Pt2Sn(111). First the electronic structure of the bulk alloys is determined: a charge transfer occurs from Sn to Pt, the work function decreases, and the d-band center is shifted away from the Fermi level. Then various adsorption structures of acrolein (propenal), crotonaldehyde (2-butenal), and prenal (3-methyl, 2-butenal) are considered on the two alloys. The results are compared with those obtained on Pt(111). A large decrease of the adsorption energies is observed for the alloys. For acrolein, there is almost no change in the best adsorption modes, the adsorption through the CC bond being predominant. This explains why the selectivity of the acrolein hydrogenation is not changed much when PtSn alloys and Pt are compared. For prenal on the contrary, only the atop mode is stable on the alloys, whereas a structure parallel to the surface is the most stable one on Pt. This explains the modified reaction selectivity with a larger amount of unsaturated alcohol in the products in the case of the Sn alloys." @default.
• W2106345900 created "2016-06-24" @default.
• W2106345900 creator A5065704104 @default.
• W2106345900 date "2003-11-15" @default.
• W2106345900 modified "2023-10-12" @default.
• W2106345900 title "Influence of Sn additives on the selectivity of hydrogenation of α-β-unsaturated aldehydes with Pt catalysts: a density functional study of molecular adsorption" @default.
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• W2106345900 doi "https://doi.org/10.1016/s0021-9517(03)00249-5" @default.
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