Inverse temperature dependence due to catalyst deactivation in liquid phase citral hydrogenation over Pt/Al2O3

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Abstract

Citral hydrogenation was studied over a Pt/Al2O3 catalysts in cyclohexane and in 2-pentanol. Several kinetic trends, which were correlated to catalyst deactivation, were achieved. Accumulation of trans isomers in both citral and in unsaturated alcohols was visible under deactivating conditions. The further hydrogenation of citronellal was nearly totally inhibited due to catalyst deactivation, whereas nerol, geraniol and citronellol formation were enhanced at higher temperatures and pressures. The main unusual kinetic phenomena in citral hydrogenation in 2-pentanol were, first, a maximum observed in the initial hydrogenation rates as a function of temperature caused by catalyst deactivation and, second, a minimum in citral conversion after prolonged reaction times. The reason for these unusual kinetic phenomena is decarbonylation reaction occurring during hydrogenation, i.e. formation of CO, which was confirmed by temperature programmed desorption of geraniol from a reduced Pt/Al2O3 catalyst.

Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalChemical Engineering Journal
Volume122
Issue number3
DOIs
Publication statusPublished - 15 Sep 2006
MoE publication typeA1 Journal article-refereed

Keywords

  • Citral
  • Deactivation
  • Hydrogenation
  • Kinetics

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