An ultraviolet Raman spectroscopic study of coke formation in methanol to hydrocarbons conversion over zeolite H-MFI

Yek Tann Chua, Peter C. Stair

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The formation of retained hydrocarbons or coke in the conversion of methanol and dimethylether to hydrocarbons over zeolite H-MFI was studied using ultraviolet Raman spectroscopy. Polyolefin, cyclopentadienyl species, and polyaromatic hydrocarbons have been identified among the retained hydrocarbons from the Raman spectra. The results strongly support a reaction mechanism, proposed previously, where cyclopentadienyl species are identified as a key intermediate in the formation of aromatic and polyaromatic hydrocarbons by ring expansion. The spectra also suggest that the polyaromatic hydrocarbons have a chain-like topology, similar to polycenes, rather than a two-dimensional, sheet-like topology, similar to pyrene or coronene.

Original languageEnglish
Pages (from-to)39-46
Number of pages8
JournalJournal of Catalysis
Issue number1
Publication statusPublished - Jan 1 2003



  • Coking
  • Cyclopentadiene
  • H-MFI
  • Methanol
  • Polyaromatic
  • Polyolefin
  • Raman

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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