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Enhanced Activity via Surface Modification of Fe-Based Fischer–Tropsch Catalyst Precursor with Titanium Butoxide

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Abstract

The surface of a model iron catalyst precursor was modified with titanium butoxide to introduce Fe–O–Ti interactions in a controlled manner and to investigate the role of these interactions in the catalyst. The reduction of the model catalyst precursors in hydrogen at 350 °C for 16 h leads to the formation of α-Fe and an iron–titanium mixed oxide, due to the incorporation of Ti into the iron oxide structure. The α-Fe phase is transformed into χ-Fe5C2 during the Fischer–Tropsch synthesis at 250 °C, whilst the Fe–Ti mixed oxide phase is preserved. A higher reaction temperature of 300 °C is required to transform some the oxide phase into a carbide phase under Fischer–Tropsch conditions. The intrinsic activity of the iron carbide phase in samples also containing the Fe–Ti mixed oxide phase is at a reaction temperature of 250 °C ca. 20 % more active than in the sample, which does not contain the mixed oxide.

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Author notes

  1. Ramoshibidu P. Mogorosi

    Present address: Sasol Technology R&D, Sasolburg, 1947, South Africa

Authors and Affiliations

  1. DST-NRF Centre of Excellence in Catalysis, Centre for Catalysis Research, Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch, Cape Town, 7701, South Africa

    Ramoshibidu P. Mogorosi, Michael Claeys & Eric van Steen

Authors
  1. Ramoshibidu P. Mogorosi
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  2. Michael Claeys
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  3. Eric van Steen
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Correspondence to Eric van Steen.

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Mogorosi, R.P., Claeys, M. & van Steen, E. Enhanced Activity via Surface Modification of Fe-Based Fischer–Tropsch Catalyst Precursor with Titanium Butoxide. Top Catal 57, 572–581 (2014). https://doi.org/10.1007/s11244-013-0213-0

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  • DOI: https://doi.org/10.1007/s11244-013-0213-0

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