Metal deposition and deactivation of hydrodemetallation catalysts
| Autor: | James Wei, Xinjin Zhao |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
inorganic chemicals
Applied Mathematics General Chemical Engineering Inorganic chemistry Mineralogy chemistry.chemical_element General Chemistry Industrial and Manufacturing Engineering Catalysis Metal Nickel chemistry Molybdenum Transmission electron microscopy visual_art Scanning transmission electron microscopy otorhinolaryngologic diseases visual_art.visual_art_medium Crystallite Cobalt |
| Zdroj: | Chemical Engineering Science. 47:2721-2726 |
| ISSN: | 0009-2509 |
| DOI: | 10.1016/0009-2509(92)87119-b |
| Popis: | Nickel deposition on sulfided and unsulfided CoMo/γAl 2 O 3 hydrometallation catalysts were investigated. Both element mapping and X-ray microanalysis from scanning transmission electron microscopy showed that the elemental distribution of deposited nickel were correlated with metal distributions of cobalt, but not with elemental distributions of molybdenum. The probable reason for the preferentiality is migration of the nickel deposition rather than deposition kinetics. Random sphere model calculations showed that segregated large crystallites of nickel deposition lead to less deactivation, in comparison with uniform layers of nickel deposition. |
| Databáze: | OpenAIRE |
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