Effect of calcination conditions on the dispersion of cobalt over Re, Ru and Rh promoted Co/γ-Al₂O₃ catalysts
Romar, Henrik; Rivoire, Eric; Tynjälä, Pekka; Lassi, Ulla (2017-05-30)
Romar, H., Rivoire, E., Tynjälä, P. et al. Top Catal (2017) 60: 1408. https://doi.org/10.1007/s11244-017-0822-0
© Springer Science+Business Media New York 2017. The final publication is available at Springer via http://dx.doi.org/10.1007/s11244-017-0822-0.
The effects of catalyst calcination conditions, such as calcination temperature and calcination atmosphere composition on the dispersion of cobalt particles over Co/γ-Al₂O₃ catalysts for Fischer–Tropsch conversion of synthesis gas are studied. A number of catalysts were prepared by incipient wetness impregnation of 20-wt% of cobalt onto γ-Al₂O₃ and promoted with 0.5 wt% ruthenium, rhenium, and rhodium. Metal dispersions of active metals were studied by chemisorption of carbon monoxide. The highest dispersion for Co/γ-Al₂O₃ catalyst was achieved by calcination at 400 °C in a flow of N₂. Co metal dispersion seem to be increased in the calcination steps if a flowing gas was used instead of static calcination conditions. The addition of promoter metals like Ru, Re or Rh enhances the dispersion of the active metal.
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