Catalytic oxidative transformation of betulin to its valuable oxo-derivatives over gold supported catalysts: Effect of support nature
| Autor: | D. Yu. Murzin, E. Kolobova, Nina Bogdanchikova, Ekaterina Pakrieva, Janne Peltonen, S. O. Kazantsev, Sónia A. C. Carabineiro, Alexey Pestryakov, Päivi Mäki-Arvela, A. Grigoreva |
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| Rok vydání: | 2021 |
| Předmět: |
Order of reaction
Betulin Hydrotalcite 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry Colloidal gold Betulinic acid 0210 nano-technology Selectivity Nuclear chemistry |
| Zdroj: | Catalysis Today. 367:95-110 |
| ISSN: | 0920-5861 |
| Popis: | Liquid-phase oxidation of betulin extracted from birch bark was studied over gold catalysts supported on a range of supports (hydrotalcite, ZrO2, ZnO, MgO, CeO2, La2O3, HMS and various alumina) with different morphology and properties. Gold catalysts as well as the corresponding supports were characterized by XRD, BET, ICP-OES, XPS and TEM. It was found that the nature of the support plays a decisive role in betulin oxidation over gold-based catalysts, expressed in the influence on the average size and distribution of gold nanoparticles and, thereby, on their catalytic performance (activity and selectivity) in betulin oxidation. Moreover, it was revealed that betulin oxidation catalyzed by gold is a structure sensitive reaction, requiring an optimal size of gold nanoparticles of ca. 3.3 nm. The most suitable support for gold was found to be alumina. Kinetic studies allowed determination of reaction orders and conditions favorable for selective formation of a particular oxo-derivative of betulin (betulone, betulinic and betulonic aldehydes, betulinic acid). |
| Databáze: | OpenAIRE |
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