Influence of sulphidation conditions on the properties of NiW/Al2O3 hydrotreating catalysts
作者： Michèle Breysse , Martine Cattenot , Thierry Decamp , Roger Frety , Christian Gachet
DOI: 10.1016/0920-5861(88)87045-7
关键词: Chemistry 、 Hydrogenolysis 、 Crystallite 、 X-ray photoelectron spectroscopy 、 Inorganic chemistry 、 Catalysis 、 Tungsten 、 Hydrodesulfurization 、 Chemisorption 、 Molecule
摘要: The sulphidation of a nickel-tungsten catalyst has been studied by XPS and electron microscopy. These features are related to catalytic properties in test reactions characteristic of hydrotreatment (HDS, HDN, HN of aromatics) and to chemisorption measurements. It was observed that for a sulphidation temperature of 400° C, only 70% of the tungsten atoms are in a WS 2-like form; this proportion increases to 95% at 650° C. High-resolution microscopy results indicate that a slight lateral growth of the WS 2-like crystals occurs above 500° C. The …
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