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- W137652699 abstract "Abstract The effect of partial reduction on the thioresistance of the metals was evaluated on two series of nickel catalysts. The first series, comprising Ni/Al 2 O 3 samples with variable metal loading (2 to 12 wt%) were characterized (metal area, degree of reduction), using two different methods: chemisorption of gases (H 2 , O 2 ) and magnetism. Despite some discrepancies between the two methods of characterisation, it can be concluded that the presence of an unreduced phase improves the thioresistance of nickel, expressed as the number of molecules of thiophen required for deactivating one atom of surface nickel. For increasing the amount of unreduced nickel, a second series of catalysts was prepared by impregnation of nickel on NiO-Al 2 O 3 supports (pre-spinelised at 700°C). As a result, the catalysts were found to be particularly resistant to sulphur poisoning. In turn, three hypothesis were considered to interpret these results: trapping effects of sulphur by unreduced nickel species of the support, electronic effects (Ni°-Ni 2+ interactions) and geometric effects (dilution of the nickel surface by unreduced species). Complementary experiments (measurement of sulphur capacity by H 2 S chemisorption and evolution of electronic interaction by competitive hydrogenation) were used to clarify these interpretations. Trapping effects are likely but not sufficient to account for the improvment of thioresistance, which could be due also to geometric effects." @default.
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- W137652699 date "1987-01-01" @default.
- W137652699 modified "2023-10-16" @default.
- W137652699 title "The Effect of Partial Reduction on the Thioresistance of Ni/Al2O3 Catalysts" @default.
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- W137652699 doi "https://doi.org/10.1016/s0167-2991(09)60388-8" @default.
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