Formation, Operation and Deactivation of Cr Catalysts in Ethylene Tetramerization Directly Assessed by Operando EPR and XAS

Jabor Rabeah, Matthias Bauer, Wolfgang Baumann, Ann E. C. McConnell, William F. Gabrielli, Paul B. Webb, Detlef Selent, Angelika Brueckner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

Operando EPR under elevated ethylene pressure supported by in situ XAS was for the first time applied to discriminate between active and deactivating Cr species in ethylene tetramerization. Starting from Cr(III) in the Cr(acac)(3) precursor, a (PNP)Cr(II)-(CH3)(2) complex is most likely formed upon adding PNP and MMAO, which is regarded as the active species that converts ethylene to 1-octene by passing a reversible redox cycle, while reduction to Cr(I) leads to deactivation.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalACS Catalysis
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 2013

Keywords

  • chromium complexes
  • ethylene tetramerization
  • homogeneous catalysis
  • operando EPR
  • reaction mechanisms
  • IN-SITU
  • LIGAND STRUCTURE
  • OXIDATION-STATE
  • CHROMIUM
  • TRIMERIZATION
  • COMPLEXES
  • XANES
  • OLIGOMERIZATION
  • MECHANISM

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