Direct Catalytic Conversion of Ethanol to C 5+ Ketones: Role of Pd–Zn Alloy on Catalytic Activity and Stability
| Autor: | Konstantinos A. Goulas, Karthikeyan K. Ramasamy, Tanmayi Bathena, Senthil Subramaniam, Mond F. Guo, Xiao Zhang, Michel J. Gray, Libor Kovarik, Abraham Martinez |
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| Rok vydání: | 2020 |
| Předmět: |
Ethanol
010405 organic chemistry Acetaldehyde chemistry.chemical_element General Chemistry Reaction intermediate 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Yield (chemistry) Acetone Organic chemistry Aldol condensation Palladium |
| Zdroj: | Angewandte Chemie International Edition. 59:14550-14557 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | Ethanol can be used as a platform molecule for synthesizing valuable chemicals and fuel precursors. Direct synthesis of C5+ ketones, building blocks for lubricants and hydrocarbon fuels, from ethanol was achieved over a stable Pd-promoted ZnO-ZrO2 catalyst. The sequence of reaction steps involved in the C5+ ketone formation from ethanol was determined. The key reaction steps were found to be the in situ generation of the acetone intermediate and the cross-aldol condensation between the reaction intermediates acetaldehyde and acetone. The formation of a Pd-Zn alloy in situ was identified to be the critical factor in maintaining high yield to the C5+ ketones and the stability of the catalyst. A yield of >70 % to C5+ ketones was achieved over a 0.1 % Pd-ZnO-ZrO2 mixed oxide catalyst, and the catalyst was demonstrated to be stable beyond 2000 hours on stream without any catalyst deactivation. |
| Databáze: | OpenAIRE |
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