Sintered Fe/CNT framework catalysts for CO2 hydrogenation into hydrocarbons
| Autor: | Konstantin I. Maslakov, Sergey V. Maksimov, Petr A. Chernavskii, V. I. Bogdan, Sergei A. Chernyak, D. N. Stolbov, Serguei V. Savilov, A. E. Koklin, Yana A. Pokusaeva, Anton S. Ivanov |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
chemistry.chemical_element Spark plasma sintering 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Supercritical fluid 0104 chemical sciences law.invention Catalysis Metal chemistry.chemical_compound chemistry Nanocrystal Chemical engineering law visual_art visual_art.visual_art_medium General Materials Science 0210 nano-technology Carbon Iron oxide nanoparticles |
| Zdroj: | Carbon. 168:475-484 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2020.06.067 |
| Popis: | Because of its contribution to greenhouse effect, carbon dioxide conversion to valuable chemicals is one of the most challenging issues facing the modern world. A new type of iron catalysts of CO2 hydrogenation into hydrocarbons was synthesized by spark plasma sintering of carbon nanotubes decorated with iron oxide nanoparticles. This treatment produced carbon-encapsulated iron nanocrystals embedded in a dense framework of CNTs. The sintered catalysts were tested without pre-reduction in CO2 hydrogenation under supercritical conditions (350 °C, 8.5 MPa) and showed high specific activities of 5.4–12.2 molCO2gFe−1s−1 and promising C2+ selectivities of 40–50 mol.% at rather low H2:CO2 ratios of 1 and 2. The high efficiency of the catalysts was attributed to the stabilization of metal nanoparticles by carbon shells and increased density of CNT support, which led to higher degree of metal – support interaction and intensified carbidization and CO activation. |
| Databáze: | OpenAIRE |
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