Platinum and Other Transition Metal Nanoclusters (Pd, Rh) Stabilized by PAMAM Dendrimer as Excellent Heterogeneous Catalysts: Application to the Methylcyclopentane (MCP) Hydrogenative Isomerization
| Autor: | Gérôme Melaet, Rong Ye, Walter T. Ralston, Gabor A. Somorjai, Christophe Deraedt |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Mechanical Engineering chemistry.chemical_element Bioengineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences 0104 chemical sciences Nanoclusters Catalysis chemistry.chemical_compound chemistry Dendrimer General Materials Science Dehydrogenation 0210 nano-technology Platinum Selectivity Isomerization Methylcyclopentane |
| Zdroj: | Nano letters. 17(3) |
| ISSN: | 1530-6992 |
| Popis: | Pt, Rh, and Pd nanoclusters stabilized by PAMAM dendrimer are used for the first time in a gas flow reactor at high temperature (150–250 °C). Pt nanoclusters show a very high activity for the hydrogenation of the methylcyclopentane (MCP) at 200–225 °C with turnover freqency (TOF) up to 334 h–1 and selectivity up to 99.6% for the ring opening isomerization at very high conversion (94%). Rh nanoclusters show different selectivity for the reaction, that is, ring opening isomerization at 175 °C and cracking at higher temperature whereas Pd nanoclusters perform ring enlargement plus dehydrogenation, while maintaining a high activity. The difference in these results as compared to unsupported/uncapped nanoparticles, demonstrates the crucial role of dendrimer. The tunability of the selectivity of the reaction as well as the very high activity of the metal nanoclusters stabilized by dendrimer under heterogeneous conditions open a new application for dendrimer catalysts. |
| Databáze: | OpenAIRE |
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