Deactivation in continuous deoxygenation of C18-fatty feedstock over Pd/sibunit

Anders Theilgaard Madsen, Bartosz Rozmysłowicz, Päivi Mäki-Arvela, Irina L. Simakova, Kari Eränen, Dmitry Yu Murzin*, Rasmus Fehrmann

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)714-724
Number of pages11
JournalTopics in Catalysis
Volume56
Issue number9-10
DOIs
Publication statusPublished - Jun 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Decarboxylation
  • Deoxygenation
  • Fats
  • Fatty acids
  • Pd catalyst
  • Renewable diesel

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