Elementary steps in the formation of hydrocarbons from surface methoxy groups in HZSM-5 seen by synchrotron infrared microspectroscopy

Ivalina Minova, Santhosh Matam, Alex Greenaway, Richard Catlow, Mark Frogley, Gianfelice Cinque, Paul A. Wright, Russell Howe

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
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Abstract

Synchrotron infrared microspectroscopy has identified with high temporal resolution (down to 0.25 s) the initial events occurring when methanol vapor is in contact with a crystal of zeolite HZSM-5. The first alkenes are generated directly from methoxy groups formed at the acid sites via their deprotonation. These alkenes can either desorb directly or oligomerize and cyclize to form dimethylcyclopentenyl cations. The oligomeric and dimethylcyclopentenyl cations are the first major components of the hydrocarbon pool that precede aromatic hydrocarbons and lead to indirect alkene formation. The technique observes these events in real time.
Original languageEnglish
Pages (from-to)6564-6570
Number of pages7
JournalACS Catalysis
Volume9
Early online date17 Jun 2019
DOIs
Publication statusE-pub ahead of print - 17 Jun 2019

Keywords

  • Synchrotron infrared microspectroscopy
  • ZSM-5
  • Methanol-to-hydrocarbons
  • Hydrocarbon pool
  • Carbon-carbon bond formation
  • Micro-FTIR

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