Pyrolytic carbon as support matrix for heterogeneous oxidation catalysts: The influence of pyrolytic process on catalytic behavior
| Autor: | Maria Louloudi, Anastasia Simaioforidou, Alexandra Mavrogiorgou |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Chemistry
Process Chemistry and Technology chemistry.chemical_element Context (language use) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pollution 0104 chemical sciences Catalysis Natural rubber Chemical engineering visual_art visual_art.visual_art_medium Chemical Engineering (miscellaneous) Reactivity (chemistry) Char Pyrolytic carbon 0210 nano-technology Hybrid material Waste Management and Disposal Carbon |
| Zdroj: | Journal of Environmental Chemical Engineering. 6:1127-1136 |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2018.01.040 |
| Popis: | Two hybrid materials have been synthesized by covalent attachment of the same active catalytic component [MnII-Schiff base] on two chars (PC) and (PC2) obtained by different pyrolytic procedures of used rubber tires. The so-prepared MnII-L@PCox and MnII-L@PC2ox materials have been evaluated as heterogeneous oxidation catalysts in alkenes’ epoxidations with H2O2. PC bears more sp3 carbon atoms than the PC2 which is more graphitized and these structural features are inherited to the corresponding catalysts, that is, MnII-L@PCox bears more sp3 carbons than the more graphitized MnII-L@PC2ox. Both MnII-L@PCox and MnII-L@PC2ox were very rapid and the oxidation reactions catalysed by them were accomplished within only 1 h. Both catalysts presented high reactivity and selectivity towards formation of epoxides, however, MnII-L@PC2ox provided higher TONs values than the MnII-L@PCox. This is attributable to the higher graphitic character of PC2ox. Strikingly, the more graphitized MnII-L@PC2ox is as rapid as the MnII-L@PCox, but it lacks in recyclability. These distinct catalytic features of the MnII-L@PC2ox vs. MnII-L@PCox are discussed in the context of the carbon-supports’ characteristics resulting from their manufacturing pyrolytic process. Moreover, we show that pyrolytic char from used rubber tires can be considered a competent catalytic support vs. existing commercial activated carbons. |
| Databáze: | OpenAIRE |
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