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Deactivation in Continuous Deoxygenation of C18-Fatty Feedstock over Pd/Sibunit

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Abstract

Catalytic continuous deoxygenation of stearic acid, ethyl stearate and tristearin without any solvents was investigated using Pd/Sibunit as a catalyst in a trickle bed reactor at 300 °C. The main emphasis was to investigate the effect of gas atmosphere and catalyst deactivation. In addition to liquid-phase analysis made offline by GC, also online gas-phase analysis with IR were performed. The main liquid-phase product coming from all reactants was n-heptadecane. In addition to deoxygenation, which was observed for all substrates, also C18 and C16 alkanes were formed from tristearin. The relative ratios between stearic acid, ethyl stearate and tristearin conversions to alkanes after 3 days time-on-stream were 2.8/2.3/1.0, respectively using 5 % H2/Ar as a gas atmosphere, whereas rapid catalyst deactivation occurred with all substrates under H2-lacking atmosphere. The spent catalyst’s specific surface area profile along the downward reactor was maximum in the middle of the catalyst beds with the highest pore shrinking in the beginning and at the end of the reactor catalyst segments in the case of stearic acid and tristearin deoxygenation whereas that decreased consecutively as ethyl stearate passed through the reactor.

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Authors and Affiliations

  1. Department of Chemistry, Technical University of Denmark, Kemitorvet, Bygning 207, 2800, Kgs. Lyngby, Denmark

    Anders Theilgaard Madsen & Rasmus Fehrmann

  2. Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, 20500, Turku, Finland

    Anders Theilgaard Madsen, Bartosz Rozmysłowicz, Päivi Mäki-Arvela, Kari Eränen & Dmitry Yu. Murzin

  3. Boreskov Institute of Catalysis, Novosibirsk, Russia

    Irina L. Simakova

Authors
  1. Anders Theilgaard Madsen
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  2. Bartosz Rozmysłowicz
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  3. Päivi Mäki-Arvela
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  4. Irina L. Simakova
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  5. Kari Eränen
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  6. Dmitry Yu. Murzin
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  7. Rasmus Fehrmann
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Correspondence to Dmitry Yu. Murzin.

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Madsen, A.T., Rozmysłowicz, B., Mäki-Arvela, P. et al. Deactivation in Continuous Deoxygenation of C18-Fatty Feedstock over Pd/Sibunit. Top Catal 56, 714–724 (2013). https://doi.org/10.1007/s11244-013-0030-5

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  • DOI: https://doi.org/10.1007/s11244-013-0030-5

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