Mechanism of decomposition of surface ethoxy species to ethene and acidic OH groups on H-ZSM-5

Junko N. Kondo, Hiroshi Yamazaki, Ryota Osuga, Toshiyuki Yokoi, Takashi Tatsumi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The reaction mechanism of the decomposition of ethoxy species to ethene and acidic OH groups on H-ZSM-5 was studied by IR spectroscopy using isotope-labeled ethanol. The concerted mechanism occurring on both the ethoxy (acid) site and the counterpart lattice oxygen was suggested by GC-MS analysis of evolved d2-ethene and IR observation of the recovery of OH s groups on acid sites from the decomposition of CH3CD2O- ethoxy species. The concerted mechanism was further confirmed by the estimation of activation energy for decomposition of CH3CH2O-, CH3CD2O-, and CD3CD2O- ethoxy species, 122 ± 3, 125 ± 3, and 140 ± 5 kJ mol-1, respectively, where the kinetic isotope effect was observed for the cleavage of the CH or CD bond of the methyl group of the ethoxy species.

Original languageEnglish
Pages (from-to)2243-2246
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume6
Issue number12
DOIs
Publication statusPublished - 2015 Jun 18
Externally publishedYes

Keywords

  • catalysis
  • ethanol
  • ethoxy species
  • IR spectroscopy
  • mechanism
  • zeolite

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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