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• W2042170045 abstract "Carbon deposits originated from side organic reactions are known to strongly affect the performance of metal catalysts. Quite unexpectedly, the C atoms have been recently found to act favorably and to lead to the enhancement of the catalyst performance. In the present work we employ a density-functional method to uncover atomistic mechanisms of the very first step of modifying Pd nanoparticles by subsurface C. In the interior of Pd(1 1 1) facets C is most stable in octahedral subsurface sites; occupation of tetrahedral subsurface sites by adsorbed C atoms results in smaller stabilization. There, the surface-to-subsurface diffusion of C features distinctive activation barriers. However, near nanoparticle edges, where CHx decomposition precursors of C tend to be located, more mobile low-coordinated Pd atoms make the diffusion into tetrahedral subsurface sites almost non-activated. This peculiar “nano”-effect suggests that the initial low-temperature modification of Pd particles by atomic C is governed by a fast occupation of tetrahedral subsurface sites at edges, which therefore serve as a gate to the subsurface." @default.
• W2042170045 created "2016-06-24" @default.
• W2042170045 creator A5010186446 @default.
• W2042170045 creator A5032114586 @default.
• W2042170045 creator A5043745476 @default.
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• W2042170045 date "2009-08-01" @default.
• W2042170045 modified "2023-10-18" @default.
• W2042170045 title "Edge sites as a gate for subsurface carbon in palladium nanoparticles" @default.
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• W2042170045 doi "https://doi.org/10.1016/j.jcat.2009.05.010" @default.
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