PMID: 11916430Mar 28, 2002Paper

Investigation on the nature of the adsorption sites of pyrrole in alkali-exchanged zeolite y by nuclear magnetic resonance in combination with infrared spectroscopy

Journal of the American Chemical Society
Manuel Sánchez-Sánchez, Teresa Blasco

Abstract

Multinuclear solid-state NMR and infrared spectroscopy have been applied to investigate the host-guest interactions and the nature of the adsorption sites of pyrrole on alkali-exchanged zeolites Y (LiNaY, NaY, KNaY, and CsNaY). The presence of pyrrole provokes changes in the MAS NMR spectra of (23)Na, (7)Li, and (133)Cs to a degree dependent upon the amount adsorbed. The decrease in the quadrupolar coupling constant for (23)Na as well as the shift for (7)Li and (133)Cs signals are attributed to the interaction of the cation with the pyrrole ring system. The adsorption of pyrrole induces the displacement of cations located at SI' and SII sites toward the supercage to bind the guest molecules. In this way, the distribution of the cations at nonframework sites depends on the amount of adsorbate in the zeolite. At low loadings, pyrrole molecules bind preferentially to more electropositive cation in partially exchanged zeolites Y. Quantitative analysis by (1)H NMR shows that the cation-pyrrole complexes formed possess a stoichiometry of 1:1. The origin of the basic site heterogeneity, evidenced by the presence of several components in the -NH infrared stretching band, is investigated assuming that the heterocycle of pyrrole interact...Continue Reading

References

Nov 1, 1996·Solid State Nuclear Magnetic Resonance·M FeuersteinJ P Amoureux
Feb 27, 1998·Solid State Nuclear Magnetic Resonance·M HungerA Samoson

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Citations

Oct 6, 2015·Chemical Society Reviews·Silvia BordigaFrédéric Thibault-Starzyk
Nov 9, 2006·Physical Chemistry Chemical Physics : PCCP·Antonio BarbonMarina Brustolon
Nov 23, 2006·Journal of the American Chemical Society·Howard S LacheenEnrique Iglesia
Sep 10, 2004·Journal of the American Chemical Society·Sofía CaleroTheo L M Maesen
Jul 21, 2006·The Journal of Physical Chemistry. B·Naseem A Ramsahye, Robert G Bell
Jul 21, 2006·The Journal of Physical Chemistry. B·Denise Barthomeuf

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