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Sintering and Coking: Effect of Preparation Methods on the Deactivation of \(\hbox {Co}\)–\(\hbox {Ni/TiO}_{2}\) in Fischer–Tropsch Synthesis

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Abstract

The main challenge of this work is study effect of preparation methods, co-precipitation and sol–gel, on the deactivation of \(\hbox {Co}\)–\(\hbox {Ni/TiO}_{2}\) catalysts in Fischer–Tropsch synthesis. Revealed that coking and sintering are two main mechanisms which have a significant influence on the deactivation of the catalyst. The catalysts were tested under industrially conditions (\(T=350\,{^{\circ }}\hbox {C}\), \(P=10\,\hbox {bar}\), \(\hbox {H}_{2}/\hbox {CO}=2\) and \(\hbox {GHSV}=7200\,\hbox {h}^{-1})\) and during 300 h on stream. Although CO conversion and product selectivity were similar for both catalysts, the sample prepared by co-precipitation method showed a better catalytic performance. The mechanisms of deactivation were interpreted using TPR, TEM/EDS and XRD techniques. Depicted that coking and sintering are two predominate mechanisms for deactivation of co-precipitation and sol–gel catalysts, respectively.

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Authors and Affiliations

  1. Department of Chemistry, University of Payame Noor, Ilam, Iran

    Mahboobeh Dowlati, Nasibeh Siyavashi & Hamid Reza Azizi

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  1. Mahboobeh Dowlati
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  2. Nasibeh Siyavashi
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  3. Hamid Reza Azizi
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Correspondence to Hamid Reza Azizi.

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Dowlati, M., Siyavashi, N. & Azizi, H.R. Sintering and Coking: Effect of Preparation Methods on the Deactivation of \(\hbox {Co}\)–\(\hbox {Ni/TiO}_{2}\) in Fischer–Tropsch Synthesis. Arab J Sci Eng 43, 2441–2450 (2018). https://doi.org/10.1007/s13369-017-2845-z

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  • DOI: https://doi.org/10.1007/s13369-017-2845-z

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