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• W2022233812 abstract "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 WS2- like form; this proportion increases to 95% at 650°C. High-resolution microscopy results indicate that a slight lateral growth of the WS2-like crystals occurs above 500°C. The activity in the HN of biphenyl does not vary with the sulphidation temperature in the same way as HDS reactions. These variations of catalytic activities support the existence of two different catalytic sites for hydrogenolysis and hydrogenation reactions. The crystallite length increase observed above 500°C leads to a decrease in the number of edge positions necessary for mixed site formation and therefore a decrease in the probe molecule uptake and HDS catalytic activity." @default.
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• W2022233812 date "1988-12-01" @default.
• W2022233812 modified "2023-10-18" @default.
• W2022233812 title "Influence of sulphidation conditions on the properties of NiW/Al2O3 hydrotreating catalysts" @default.
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• W2022233812 doi "https://doi.org/10.1016/0920-5861(88)87045-7" @default.
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