Styrene synthesis: In situ characterization and reactivity studies of unpromoted and potassium-promoted iron oxide model catalysts

Osama Shekhah, Wolfgang Ranke*, Robert Schlögl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Styrene synthesis over iron oxide model catalysts was studied by combining UHV characterization methods with in situ conversion measurements in a microflow reactor under realistic reaction conditions. Both unpromoted Fe 2O3 and K-promoted model catalysts show a similar high starting activity while that of Fe3O4 is clearly lower. Water limits and K promotion slows down deactivation by coking and oxide reduction. The deactivation can be prevented and the high initial yield preserved by adding a small amount of oxygen to the feed. Both the presence of Fe3+ and intermediate adsorption strength for ethylbenzene and styrene are essential for high conversion yields.

Original languageEnglish (US)
Pages (from-to)56-68
Number of pages13
JournalJournal of Catalysis
Volume225
Issue number1
DOIs
StatePublished - Jul 1 2004

Keywords

  • Carbonaceous deposits
  • Deactivation
  • Dehydrogenation
  • Ethylbenzene
  • Iron oxide
  • Oxygen
  • Potassium
  • Promoter
  • Styrene
  • Water

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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