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A High-Resolution Transmission Electron Microscopy Study of the Influence of Fluorine on the Morphology and Dispersion of WS₂ in Sulfided W/Al₂O₃ and NiW/Al₂O₃ Catalysts

Author： Sun M. Kooyman P.J. Prins R.

Publisher： Academic Press

ISSN： 0021-9517

Source： Journal of Catalysis, Vol.206, Iss.2, 2002-03, pp. : 368-375

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Abstract

The morphology of WS₂ on sulfided tungsten and nickel–tungsten catalysts supported on alumina and fluorinated alumina, prepared from ammonium metatungstate and ammonium tetrathiotungstate, was investigated by means of high-resolution transmission electron microscopy. The sulfided catalysts prepared from ammonium metatungstate contain mainly single-layered WS₂ slabs, while those prepared from ammonium tetrathiotungstate contain more multilayered WS₂ slabs. Incorporation of nickel increases the stacking and stabilizes small WS₂ crystallites. Fluorination of the alumina support increases the fraction of multilayered WS₂ slabs and increases the WS₂ slab diameter. © 2002 Elsevier Science (USA).

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