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- W2068757617 abstract "Three Ni-Mo/Al2O3, catalysts were prepared, containing similar amounts of NiO (2.8%) and MoO3 (13.5%), by simultaneous impregnation of the active components, varying the nature of the solubilizing agent (ammonia, citric acid and phosphoric acid). The catalysts were characterized with respect to texture (surface area and pore volume), presence of crystalline phases (XRD), distribution of active components (EPMA) and nature of the active phases (DRS). Catalytic activity was measured using thiophene hydrogenolysis as a model reaction. A commercial Ni-Mo catalyst of similar composition was characterized by the same methods. The catalyst prepared in the phosphoric acid medium (catalyst P) had a significantly lower surface area. In phosphorus-containing catalysts there was a marked tendency of this element to be deposited on the external region of the catalyst extrudates. The DRS spectra showed that Mo was present predominantly as polymolybdate species in all cases. In the industrial catalyst (catalyst I) the presence of nickel spinel was clearly observed. Catalyst P had an absorption minimum in the visible region displaced to higher wavelength compared to the catalysts prepared in ammonia (catalyst A) and citric acid (catalyst C) media. The observed order of activity was P > C > A > I." @default.
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- W2068757617 date "1989-06-01" @default.
- W2068757617 modified "2023-09-23" @default.
- W2068757617 title "Characterization of Ni-Mo/Al2O3 catalysts prepared by simltaneous impregnation of the active components" @default.
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- W2068757617 doi "https://doi.org/10.1016/0920-5861(89)80009-4" @default.
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