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Deactivation of a Pt/Silica–Alumina Catalyst and Effect on Selectivity in the Hydrocracking of n-Hexadecane

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Abstract

The deactivation behavior of a bifunctional catalyst consisting of platinum on amorphous silica–alumina was studied in the hydrocracking of n-hexadecane. The initial decline in activity and the change in selectivity were monitored at the following reaction conditions: pressure = 30 bar; temperature = 310 °C; hydrogen-to-hexadecane feed molar ratio = 10. Initially, hexadecane conversion and selectivity to cracking products decreased rapidly with time-on-stream, and stabilized after 40 h on stream. This could be related to an initial loss of metal surface area, which decreased the activity of monofunctional hydrogenolysis generating cracking products. The acidic function seemed to be unaffected under these reaction conditions. The stable catalyst was exposed to a lower hydrogen-to-hexadecane ratio to accelerate deactivation by coking. A decline in the activity of both functions was observed. The activity of the acidic function could be almost completely recovered by oxidative regeneration, while the metal activity was only partially recovered.

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Acknowledgments

Thanks to Peter Hedström, Dept. Materials Science and Engineering, KTH for his help with the TEM analyses. The Swedish Energy Agency is acknowledged for financial support.

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Authors and Affiliations

  1. Department of Chemical Engineering and Technology, School of Chemistry, KTH Royal Institute of Technology, Teknikringen 42, 100 44, Stockholm, Sweden

    Francesco Regali, Rodrigo Suárez París, Magali Boutonnet & Sven Järås

  2. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, Turku, Finland

    Atte Aho

Authors
  1. Francesco Regali
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  2. Rodrigo Suárez París
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  3. Atte Aho
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  4. Magali Boutonnet
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  5. Sven Järås
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Correspondence to Francesco Regali.

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Regali, F., París, R.S., Aho, A. et al. Deactivation of a Pt/Silica–Alumina Catalyst and Effect on Selectivity in the Hydrocracking of n-Hexadecane. Top Catal 56, 594–601 (2013). https://doi.org/10.1007/s11244-013-0011-8

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