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• W2038457029 endingPage "10982" @default.
• W2038457029 startingPage "10977" @default.
• W2038457029 abstract "The structures of fluorinated oxidic and sulfided W/γ-Al2O3 and NiW/γ-Al2O3 catalysts were studied by means of multinuclear MAS NMR and BET measurements. The quantitative 1H and 19F MAS NMR results show that fluorination of γ-alumina favors the formation of polymeric tungstate in the catalysts and promotes the sulfidation of tungsten. Addition of tungsten to fluorinated γ-Al2O3 leads to the transformation of part of the type-S1 fluorine, bonded to one aluminum atom, to the type-S3 fluorine, bonded to three aluminum atoms. Sulfidation results in a reorganization of the hydroxyl groups on the surface of fluorinated alumina and in a partial hydrolysis of the alumina network because of the H2O produced during sulfidation and the inductive effect of fluorine on the alumina lattice. Nickel reduces the NMR signal intensities in the oxidic samples because of its strong paramagnetic effect on the 1H, 19F, and 27Al resonances. Sulfidation decreases the paramagnetic effect of nickel because of the combination of nickel with WS2 into the Ni−W−S structure." @default.
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• W2038457029 date "2003-09-12" @default.
• W2038457029 modified "2023-10-12" @default.
• W2038457029 title "A High-Resolution MAS NMR Study of the Structure of Fluorinated NiW/γ-Al₂O₃ Hydrotreating Catalysts" @default.
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• W2038457029 doi "https://doi.org/10.1021/jp030408t" @default.
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