Transport properties of ammonia in a series of Na+-faujasite zeolites as studied by 2H NMR technique

Frédéric Gilles, Jean Luc Blin, Bao Lian Su

Research output: Contribution to journalArticlepeer-review

Abstract

The molecular motion of ammonia has been investigated in Na +-faujasite zeolites with various Si/Al ratios from 1.2 to 3.4. 2H NMR spectra show fast isotropic reorientation of the ammonia at room temperature, which indicates the jump of the molecule from one adsorption site to another. A fast rotation around its three-fold axis is observed with decreasing temperature. The correlation time and activation energy values have been determined and reveal a significant decrease in ammonia mobility, with decreasing Si/Al ratio, that has been correlated with the negative charge of the framework oxygen atoms.

Original languageEnglish
Pages (from-to)253-256
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume241
Issue number1-3
DOIs
Publication statusPublished - 14 Jul 2004

Keywords

  • H NMR
  • Ammonia
  • Diffusion coefficient
  • Molecular motion
  • Na-faujasites

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