In situ PFG NMR study of intracrystalline diffusion during ethene conversion in ZSM-5

R. Q. Snurr, A. Hagen, H. Ernst, H. B. Schwarz, S. Ernst, J. Weitkamp, J. Kärger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Pulsed field gradient (PFG) NMR spectroscopy has been applied to measure the self-diffusivity of an inert probe species in situ during a zeolite-catalyzed reaction. Specifically, 19F PFG NMR was used to measure CF4 intracrystalline mobility during ethene conversion in H-ZSM-5 as a function of reaction time in sealed glass samples. CF4 was shown to be a suitable probe species, and its mobility was seen to be sensitive to changes in the composition of the reacting system with time for the conversion of ethene in H-ZSM-5. Also, the self-diffusivity of CF4 in well-defined nonreacting mixtures could be correlated with the mobility and changing composition of the reacting system. Studies of the reaction kinetics were performed by 13C MAS NMR and with a recirculation reactor. At low temperatures (approx. 373 K) ethene is converted mainly to paraffins. The gas-phase products observed in the recirculation system ranged from C2 to C7 alkanes.

Original languageEnglish (US)
Article number0312
Pages (from-to)130-137
Number of pages8
JournalJournal of Catalysis
Volume163
Issue number1
DOIs
StatePublished - 1996

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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