Liquid phase hydrogenation of citral: Suppression of side reactions

Päivi Mäki-Arvela, Lasse Pekka Tiainen, Ahmad Kalantar Neyestanaki, Rainer Sjöholm, Tiina Kaisa Rantakylä, Ensio Laine, Tapio Salmi, Dmitry Yu Murzin

Research output: Contribution to journalArticleScientificpeer-review

76 Citations (Scopus)

Abstract

Selective hydrogenation of citral was investigated at 70°C in four different alcohols over Ru, Rh and Ni supported catalysts. The main aim was to suppress the side reaction, like acetalization and cyclization of citronellal. Acetalization could be suppressed either by using chloride-free catalyst precursors and other supports than active carbon or by using longer chained alcohols, like 2-pentanol and 2-methyl-2-propanol as solvents. The highest maximum selectivity to citronellol (92%) was obtained in citral hydrogenation in ethanol over Ni/Al2O3 catalyst, which was pre-reduced ex situ at 350°C and in situ at 350°C for 2h in ethanol. The acidic alumina support was covered by spillover hydrogen, suppressing the acetalization reaction. Citronellal cyclization increased with the increasing solvent hydrophobicity and was also larger over active carbon supported Ru catalyst.

Original languageEnglish
Pages (from-to)181-200
Number of pages20
JournalApplied Catalysis A: General
Volume237
Issue number1-2
DOIs
Publication statusPublished - Nov 2002
MoE publication typeA1 Journal article-refereed

Keywords

  • Acetalization
  • Citral hydrogenation
  • Cyclization
  • Nickel

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