3 years ago

Effect of Calcination Conditions on the Dispersion of Cobalt Over Re, Ru and Rh Promoted Co/γ-Al 2 O 3 Catalysts

Pekka Tynjälä, Ulla Lassi, Eric Rivoire, Henrik Romar

Abstract

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.

Publisher URL: https://link.springer.com/article/10.1007/s11244-017-0822-0

DOI: 10.1007/s11244-017-0822-0

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