CH3-ReO3 on γ-Al2O3: Activity, selectivity, active site and deactivation in olefin metathesis

Alain Salameh, Anne Baudouin, Daravong Soulivong, Volker Boehm, Michael Roeper, Jean-Marie Maurice Basset*, Christophe Copéret

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The active sites (15% of total Re) of CH3ReO3 supported on alumina arise solely from the reaction of the C{single bond}H bond of CH3ReO3 with reactive AlS{single bond}OS sites of a γ-Al2O3 surface to yield [AlSCH2ReO3], whereas the major species, inactive, corresponds to MeReO3 chemisorbed through its oxo ligand(s) on Lewis acid sites of alumina. Monitoring the active sites of CH3ReO3 supported on alumina by solid-state NMR spectroscopy shows that no carbenic signals are observed and that the resting states of the catalyst in the metathesis of propene correspond to μ-methylene and μ-ethylidene species, so that the propagating carbenic species are likely formed only in the presence of olefins. Although this system is highly active in the metathesis of propene, with initial rates similar to some of the best catalysts, it undergoes fast deactivation, which is due to the propene metathesis products, most likely ethene.

Original languageEnglish (US)
Pages (from-to)180-190
Number of pages11
JournalJournal of Catalysis
Volume253
Issue number1
DOIs
StatePublished - Jan 1 2008

Keywords

  • Active site
  • Alumina
  • Deactivation
  • Flow kinetic
  • Heterogeneous catalysis
  • Methyl trioxorhenium
  • Olefin metathesis

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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