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Effects of Promoters on the Physicochemical Properties of Cobalt-Iron Catalysts Supported on Multiwalled-Carbon Nanotubes

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Abstract

Cobalt-iron bimetallic catalysts promoted with Nb, Ru or Rh and supported on multiwalled-carbon nanotubes (MWCNTs) were synthesized using a reverse-microemulsion method. The synthesized catalysts were characterized by TEM, N2-physical adsorption, XPS, XRD, and TPD/R/O methods. XPS analyses showed an increasing trend of the Co2+/Co3+ atomic ratios for the promoted catalysts, compared to that of the un-promoted Co–Fe/CNTs catalyst. The dispersion for the un-promoted Co–Fe /CNTs catalyst was 15.9% and it increased to 23.0, 20.4, and 17.7% in the presence of 0.1 wt.% Nb, Ru, and Rh promoter, respectively. The addition of Nb-promoter also improved the reducibility of the catalyst as exhibited by the H2-TPR study. The presence of Nb, Ru, and Rh promoters improved the catalytic performance in a Fischer–Tropsch synthesis where the TOF over the un-promoted catalyst increased from 5.1 to 6.2, 5.7, 5.2 × 10–1 s−1 upon the addition of Nb, Ru and Rh promoter, respectively. Thus, the Nb promoter was a better promoter than Ru and Rh for the Co–Fe/CNTs catalyst.

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Acknowledgements

This work was supported by the Ministry of Education (Higher Education Department) under MyRA Incentive Grant Program (cost center: 0153AB-J06) and Universiti Teknologi PETRONAS.

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MyRA Incentive Grant Program,cost center: 0153AB-J06

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  1. Department of Fundamental and Applied Sciences, Center of Contaminant Control and Utilization, Institute Contaminant Management for Oil and Gas, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia

    Hami Haslinda Hamid, Noor Asmawati Mohd Zabidi & Maizatul Shima Shaharun

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Hamid, H.H., Mohd Zabidi, N.A. & Shaharun, M.S. Effects of Promoters on the Physicochemical Properties of Cobalt-Iron Catalysts Supported on Multiwalled-Carbon Nanotubes. Catal Lett 154, 245–258 (2024). https://doi.org/10.1007/s10562-023-04294-2

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