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• W2070565462 abstract "Using a periodic slab-model density-functional approach we compared the decomposition of ethylene on the M(1 1 1) surfaces of the transition metals M = Pd, Pt, Rh, and Ni. The set of model reactions included four dehydrogenation steps and one final C–C bond breaking: C2H4 (ethylene) → C2H3 (vinyl) → C2H2 (acetylene) → C2H (ethynyl) → C2 (carbon dimer) → C + C. The dehydrogenation steps of ethylene and vinyl are more facile than those of acetylene and ethynyl. Dehydrogenation reactions occur easier, both kinetically and thermodynamically, on Ni(1 1 1) and Rh(1 1 1) than on Pd(1 1 1) and Pt(1 1 1). C2 decomposition is an exothermic process on Pd(1 1 1), Pt(1 1 1), and Rh(1 1 1), whereas the formation of C2, a precursor of graphene and coke, is kinetically and thermodynamically most plausible on Ni(1 1 1). The calculated results reveal trends of the binding energies (BE) of the species on the four metals in the order BE(C2H4) < BE(C2H2) < BE(C2H3) < BE(C2H) < BE(C2) < BE(C). The binding energies of ethylene and vinyl are largest on Pt(1 1 1) while other species with a lower hydrogen content exhibit the largest BE values on the surfaces Rh(1 1 1) and Ni(1 1 1). We also explored the effect of coverage on the binding energies." @default.
• W2070565462 created "2016-06-24" @default.
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• W2070565462 date "2011-06-01" @default.
• W2070565462 modified "2023-10-18" @default.
• W2070565462 title "Decomposition of ethylene on transition metal surfaces M(111). A comparative DFT study of model reactions for M=Pd, Pt, Rh, Ni" @default.
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• W2070565462 doi "https://doi.org/10.1016/j.molcata.2011.04.019" @default.
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