| Autor: | A.M. van der Kraan, M.W.J. Crajé, P.J. van Berge, J. van de Loosdrecht |
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| Rok vydání: | 2002 |
| Předmět: |
inorganic chemicals
Nuclear and High Energy Physics Materials science Inorganic chemistry chemistry.chemical_element Fischer–Tropsch process Condensed Matter Physics Atomic and Molecular Physics and Optics Catalysis chemistry Phase (matter) Mössbauer spectroscopy Surface oxidation Crystallite Emission spectrum Physical and Theoretical Chemistry Cobalt |
| Zdroj: | Hyperfine Interactions. :3-18 |
| ISSN: | 0304-3843 |
| DOI: | 10.1023/a:1021265701186 |
| Popis: | The application of Mossbauer emission spectroscopy to study cobalt based Fischer–Tropsch catalysts for the gas-to-liquids process was investigated. It was shown that Mossbauer emission spectroscopy could be used to study the oxidation of cobalt as a deactivation mechanism of high loading cobalt based Fischer–Tropsch catalysts. Oxidation was observed under conditions that are in contradiction with the bulk cobalt phase thermodynamics. This can be explained by oxidation of small cobalt crystallites or by surface oxidation. The formation of re-reducible Co3+ species was observed as well as the formation of irreducible Co3+ and Co2+ species that interact strongly with the alumina support. The formation of the different cobalt species depends on the oxidation conditions. Iron was used as a probe nuclide to investigate the cobalt catalyst preparation procedure. A high-pressure Mossbauer emission spectroscopy cell was designed and constructed, which creates the opportunity to study cobalt based Fischer–Tropsch catalysts under realistic synthesis conditions. |
| Databáze: | OpenAIRE |
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