Silica-alumina-supported, tungsten-based heterogeneous alkane metathesis catalyst: Is it closer to a silica- or an alumina-supported system?

Erwan Le Roux, Mostafa Taoufik*, Anne Baudouin, Christophe Copéret, Jean Thivolle-Cazat, Jean-Marie Maurice Basset, Barry M. Maunders, Glenn J. Sunley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Grafting of [W(≡C-t-Bu)(CH2-t-Bu)3] (1) on silica-alumina partially dehydroxylated at 500°C generates a surface complex [(≡SiO)W(≡C-t-Bu)-(CH2-t-Bu)3] (2) as evidenced by mass balance analysis, IR, and NMR spectroscopy. Upon treatment of this species under H2, a tungsten hydride derivative, [(≡SiO)(EO)W(H)x] (3), (E=Si or Al), is formed. Both of these complexes are active as alkane metathesis catalysts. The activity of this hydride is similar to that observed for the tungsten hydride-supported on alumina and much greater than that obtained on silica. Noteworthy are the selectivities in higher alkane homologues, that is Cn+1>C n+2, which are fully consistent with olefin metathesis being the key homologation process.

Original languageEnglish (US)
Pages (from-to)231-237
Number of pages7
JournalAdvanced Synthesis and Catalysis
Volume349
Issue number1-2
DOIs
StatePublished - Jan 1 2007

Keywords

  • Alkanes
  • Hydrides
  • Metathesis
  • Silica-alumina
  • Tungsten

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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