Characterization of cobalt Fischer-Tropsch catalysts I. Unpromoted cobalt-silica gel catalysts
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2022, Materials Chemistry and PhysicsCitation Excerpt :After the annealing, the peak slightly shifts from 529.3 to 529.6 eV because of the chemical reaction between Co(B) and underlying SiO2 forming Co2SiO4 due to the electronegativity difference and oxygen affinity between the respective ion [38]. Formation of cobalt oxide can cause a shift of O 1s peak towards a higher binding energy [39]. Further, as Si 2p core level spectra shown (Fig. 4), shift of the Si 2p from 101.7 eV to 102.7 eV also implies the formation of Si–O4 [39,40].
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2020, Catalysis TodayCitation Excerpt :The first reduction peak for the unmodified Co3O4 nanocubes occurs at 530 K and the second peak occurs at 700 K. This is typically ascribed to the two-step reduction process of Co3O4 → CoO → Co [19,38–41]. The ratio of hydrogen consumption attributed to the two reduction peaks is much smaller than the required ratio of 1:3 for this reduction process.
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