| Autor: | A. M. Alekseev, V. M. Perov, Boris N. Kuznetsov, V. I. Yakerson |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
inorganic chemicals
Hydrogen Chemistry Potassium Inorganic chemistry chemistry.chemical_element General Chemistry Catalysis Computer Science Applications Potassium oxide Ammonia production chemistry.chemical_compound X-ray photoelectron spectroscopy Modeling and Simulation Aluminium oxide Surface layer |
| Zdroj: | Kinetics and Catalysis. 42:92-96 |
| ISSN: | 0023-1584 |
| DOI: | 10.1023/a:1004809014917 |
| Popis: | The surface composition of a model catalyst for ammonia synthesis based on iron promoted with aluminum and potassium oxides was investigated by X-ray photoelectron spectroscopy. The surface was studied in oxidized, passivated, and reduced states. The redistribution of components on the surface is studied in the course of reduction in hydrogen and overheating at 700°C. It is shown that a 4–6-mn thick surface layer is enriched with promoters (K and Al) and impurities (Si), while the concentration of iron is low. Promotion by potassium and aluminum oxides makes the catalyst more resistant to overheating. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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