Anchoring of palladium nanoparticles on N-doped mesoporous carbon
| Autor: | Till Eckhard, Lisa Warczinski, Christof Hättig, Baoxiang Peng, Martin Muhler, Bin Hu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Doping General Physics and Astronomy Anchoring 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Oxidation state Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Bifunctional Lone pair |
| Zdroj: | Physical chemistry chemical physics : PCCP. 22(37) |
| ISSN: | 1463-9084 |
| Popis: | Pd nanoparticles deposited on nitrogen-doped mesoporous carbon are promising catalysts for highly selective and effective catalytic hydrogenation reactions. To design and utilize these novel catalysts, it is essential to understand the effect of N doping on the metal–support interactions. A combined experimental (X-ray photoelectron spectroscopy) and computational (density functional theory) approach is used to identify preferential adsorption sites and to give detailed explanations of the corresponding metal–support interactions. Pyridinic N atoms turned out to be the preferential adsorption sites for Pd nanoparticles on nitrogen-doped mesoporous carbon, interacting through their lone pairs (LPs) with the Pd atoms via N-LP – Pd dσ and N-LP – Pd s and Pd dπ – π* charge transfer, which leads to a change in the Pd oxidation state. Our results evidence the existence of bifunctional palladium nanoparticles containing Pd0 and Pd2+ centers. |
| Databáze: | OpenAIRE |
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