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- W8606232 abstract "Two series of thiophene-sulfided NiMo/Al2O3 catalysts, with constant molybdenum content (7 and 16 wt% MoO3, respectively) and variable nickel concentration have been characterized by their thiophene hydrodesulfurization activities and their chemisorption capacities measured in situ. Carbon monoxide adsorption was performed at 0 °C and oxygen uptake at 60 °C. Both adsorbate molecules exhibit similar behavior in the series and are thought to be good probes for anion vacancies. For the first series of catalysts, the characterizations distinguish three concentration ranges according to the Ni/Mo ratio. The main enhancement of activity is observed in the range 0.2 < Ni/Mo < 0.6 with a simultaneous slight increase in gas consumption. Comparison of the data with similar characterizations of Ni/Al2O3 catalysts indicates that the promoting effect is not associated with an excess of anion vacancies. The whole set of samples leads to three different kinds of correlation between activity and chemisorption, thus revealing different actions of nickel ions on the molybdenum-based catalyst. For the second series, chemisorption results are not clearly influenced by the Ni content." @default.
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- W8606232 date "1984-06-01" @default.
- W8606232 modified "2023-09-28" @default.
- W8606232 title "On the promoting effect in sulfided Ni$z.sbnd;Mo/Al2O3 catalysts as studied by chemisorption" @default.
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- W8606232 doi "https://doi.org/10.1016/0021-9517(84)90189-1" @default.
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