The activation of CD4 for H/D exchange over H-zeolites

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The H/D exchange was studied between CD4 and H-zeolites using pulsed a microcatalytic reactor and MS analysis. Methane-d3 was the only exchange product, while a large fraction of the reactant was retained by the zeolite. The apparent activation energies (Ea) were determined for CHD3 production assuming first-order reaction kinetics. The Ea was close to 80 kJ mol-1 over the H-ZSM-5 and H-mordenite, and about 50 kJ mol-1 over H-beta. Results suggested that, at the low methane loading applied, the H/D exchange was initiated predominantly by heterolytic dissociation of CD4 to CD3δ and Dδ+ over Lewis acid-Lewis base pair sites.

Original languageEnglish
Pages (from-to)29-35
Number of pages7
JournalCatalysis Letters
Issue number1-2
Publication statusPublished - Sep 1 2002


  • Deuteromethane
  • H-zeolites
  • H/D exchange
  • Lewis acid-Lewis base pair sites

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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