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Effect of Calcination Conditions on the Dispersion of Cobalt Over Re, Ru and Rh Promoted Co/γ-Al2O3 Catalysts

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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.

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Acknowledgements

The authors gratefully acknowledge the EU/Interreg Nord program (project no. 304-8488-10) for their financial support within the HighBio2 project. Rhodium nitrate and ruthenium nitrate solutions were provided by Umicore, Germany while Puralox SSCa 5-200 support was provided by Sasol Germany.

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Correspondence to Henrik Romar.

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Romar, H., Rivoire, E., Tynjälä, P. et al. Effect of Calcination Conditions on the Dispersion of Cobalt Over Re, Ru and Rh Promoted Co/γ-Al2O3 Catalysts. Top Catal 60, 1408–1414 (2017). https://doi.org/10.1007/s11244-017-0822-0

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  • DOI: https://doi.org/10.1007/s11244-017-0822-0

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