Characterisation of alkali ions in the Y-type zeolites by multi MAS NMR studies

I. Hannus, I. Kiricsi, P. Lentz, J. B. Nagy

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The NaY zeolites exchanged with other alkali cations (Li+, K+, Rb+ and Cs+) are characterised by high resolution solid state 29Si-, 27Al-, 23Na- and 133Cs-NMR. The chemical shifts of the various Si(nAl) n = 0, 1, 2, 3 and 4 configurations show particular changes as a function of the alkali counter-cations. The NMR line stemming from the Si(1Al) shows the greatest linewidth suggesting that the distribution of the chemical shift is the highest. The quantitative 23Na-NMR data allowed one to follow the Na+ exchange by the other alkali cations. The 23Na-NMR data show unambiguously that both the cation exchange and an eventual chemical reaction occur through the Na+ ions occupying the cation positions in the sodalite and super cages. The 133Cs-NMR of a dehydrated sample confirm the literature data showing that Cs+ cations may occupy any of the available cationic sites.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume158
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1999

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Zeolites
Alkalies
zeolites
Cations
alkalies
Positive ions
Nuclear magnetic resonance
Ions
cations
nuclear magnetic resonance
ions
Chemical shift
chemical equilibrium
Ion exchange
sodalite
Linewidth
Chemical reactions
chemical reactions
counters
solid state

Keywords

  • Na, Al, Si, Cs MAS NMR measurements
  • Alkali metal ion (Li, Na, K, Rb, Cs) exchanged Y- zeolites

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Characterisation of alkali ions in the Y-type zeolites by multi MAS NMR studies. / Hannus, I.; Kiricsi, I.; Lentz, P.; Nagy, J. B.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 158, No. 1-2, 01.01.1999, p. 29-34.

Research output: Contribution to journalArticle

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AB - The NaY zeolites exchanged with other alkali cations (Li+, K+, Rb+ and Cs+) are characterised by high resolution solid state 29Si-, 27Al-, 23Na- and 133Cs-NMR. The chemical shifts of the various Si(nAl) n = 0, 1, 2, 3 and 4 configurations show particular changes as a function of the alkali counter-cations. The NMR line stemming from the Si(1Al) shows the greatest linewidth suggesting that the distribution of the chemical shift is the highest. The quantitative 23Na-NMR data allowed one to follow the Na+ exchange by the other alkali cations. The 23Na-NMR data show unambiguously that both the cation exchange and an eventual chemical reaction occur through the Na+ ions occupying the cation positions in the sodalite and super cages. The 133Cs-NMR of a dehydrated sample confirm the literature data showing that Cs+ cations may occupy any of the available cationic sites.

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