SILCA – supported ionic liquid catalysts for fine chemicals

Jyri-Pekka Mikkola, Pasi Virtanen, Krisztián Kordás, Hannu Karhu, Tapio Salmi

Research output: Contribution to journalArticleScientificpeer-review

74 Citations (Scopus)

Abstract

Various ionic liquids (ILs), together with Pd-metal species were immobilized on a high-surface area, structural active carbon cloth. The resulting SILCA (supported ionic liquid catalyst) catalysts were studied in the production of fine chemicals, i.e. in the hydrogenation of unsaturated aldehydes, citral and cinnamaldehyde. These model molecules are challenging ones, due to the possibility of several parallel and consecutive reactions that can occur, depending on the experimental conditions and the nature of the catalyst. In this paper we illustrate the feasibility of altering the selectivity profiles, not only by means of altered reaction conditions but also by variation of the nature of the IL present in the catalytic layer. The catalysts were characterized by means of, e.g. nitrogen physisorption, XPS as well as FESEM and EFTEM. The results revealed that Pd derived from a Pd(acac)2-precursor, initially dissolved into the ionic liquid, undergoes a change of oxidation state from Pd2+ to Pd4+, regardless of the ionic liquid in question. However, upon decomposition of the precursor, at 373 K, under H2-flow, a transition to either Pd+ or Pd0 occurred, indicating the formation of catalytically active Pd complexes or nano particles, respectively.
Original languageEnglish
Pages (from-to)68-76
JournalApplied Catalysis A: General
Volume328
Issue number1
Publication statusPublished - 3 Jun 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Supported ionic liquids
  • Heterogeneous catalysis
  • Fine chemicals
  • Hydrogenation

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