Pd1/MgO(): a model system in nanocatalysis
| Autor: | Hannu Häkkinen, Gianfranco Pacchioni, Livia Giordano, Anna Maria Ferrari, Ueli Heiz, Uzi Landman, Stéphane Abbet |
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| Rok vydání: | 2002 |
| Předmět: |
Chemistry
Thermal desorption spectroscopy Inorganic chemistry Thermal desorption Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films Catalysis chemistry.chemical_compound Adsorption Acetylene Polymerization Transition metal Ab initio quantum chemistry methods Materials Chemistry Physical chemistry |
| Zdroj: | Surface Science. 514:249-255 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/s0039-6028(02)01637-0 |
| Popis: | Nanocatalysts consist of small size-selected clusters adsorbed on uniform sites of a support material. Here, we focus on a simple model system, which is fabricated by soft-landing atomic Pd ions on oxygen vacancies (F-centers) of a MgO(1 0 0) surface (Pd1/MgO(Fs)). We used thermal desorption and infrared spectroscopies (TDS, FTIR) to study the acetylene polymerization and the CO oxidation catalyzed by this system. In one-heating-cycle experiments, only the formation of benzene is observed during the polymerization reaction and the combustion of CO leads to the formation of CO2 detected at 260 and 500 K. Experimental results in combination with ab initio calculations reveal the mechanisms of these reactions and demonstrate the role of surface defects in nanocatalysis. 2002 Elsevier Science B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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