| Autor: |
Claudia Weidenthaler, Jacob Oskar Abildstrøm, Takeshi Kasama, Jerrik Jørgen Mielby, Søren Kegnæs, Feng Wang |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Angewandte Chemie International Edition. |
| ISSN: |
1433-7851 |
| DOI: |
10.1002/anie.201406354 |
| Popis: |
With the ongoing developments in biomass conversion, the oxidation of bioethanol to acetaldehyde may become a favorable and green alternative to the preparation from ethylene. Here, a simple and effective method to encapsulate gold nanoparticles in zeolite silicalite-1 is reported and their high activity and selectivity for the catalytic gas-phase oxidation of ethanol are demonstrated. The zeolites are modified by a recrystallization process, which creates intraparticle voids and mesopores that facilitate the formation of small and disperse nanoparticles upon simple impregnation. The individual zeolite crystals comprise a broad range of mesopores and contain up to several hundred gold nanoparticles with a diameter of 2-3 nm that are distributed inside the zeolites rather than on the outer surface. The encapsulated nanoparticles have good stability and result in 50 % conversion of ethanol with 98 % selectivity toward acetaldehyde at 200 °C, which (under the given reaction conditions) corresponds to 606 mol acetaldehyde/mol Au hour(-1) . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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