Role of cation-water disorder during cation exchange in small-pore zeolite sodium natrolite

Yongmoon Lee, Jun Sik Lee, Chi Chang Kao, Ji Ho Yoon, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

By combining X-ray diffraction with oxygen K-edge absorption spectroscopy we track changes occurring during the K+-Na+ cation exchange of Na-natrolite (Na-NAT) as tightly bonded Na+ cations and H2O molecules convert into a disordered K+-H2O substructure and the unit cell expands by ca. 10% after 50% cation exchange. The coordination of the confined H2O and nonframework cations change from a tetrahedral configuration, similar in ice Ih, with Na + near the middle of the channels in Na-NAT to two-bonded configuration, similar in bulk water, and K+ located near the walls of the framework in K-NAT. This is related to the enhanced ion-exchange properties of K-NAT, which, in marked contrast to Na-NAT, permits the exchange of K+ by a variety of uni-, di-, and trivalent cations.

Original languageEnglish
Pages (from-to)16119-16126
Number of pages8
JournalJournal of Physical Chemistry C
Volume117
Issue number31
DOIs
Publication statusPublished - 2013 Aug 8

Fingerprint

Zeolites
Cations
Ion exchange
Positive ions
Sodium
sodium
disorders
porosity
cations
Water
water
Ice
configurations
substructures
Absorption spectroscopy
absorption spectroscopy
ice
natrolite
N-acetyltalosaminuronic acid
Oxygen

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Lee, Yongmoon ; Lee, Jun Sik ; Kao, Chi Chang ; Yoon, Ji Ho ; Vogt, Thomas ; Lee, Yongjae. / Role of cation-water disorder during cation exchange in small-pore zeolite sodium natrolite. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 31. pp. 16119-16126.
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abstract = "By combining X-ray diffraction with oxygen K-edge absorption spectroscopy we track changes occurring during the K+-Na+ cation exchange of Na-natrolite (Na-NAT) as tightly bonded Na+ cations and H2O molecules convert into a disordered K+-H2O substructure and the unit cell expands by ca. 10{\%} after 50{\%} cation exchange. The coordination of the confined H2O and nonframework cations change from a tetrahedral configuration, similar in ice Ih, with Na + near the middle of the channels in Na-NAT to two-bonded configuration, similar in bulk water, and K+ located near the walls of the framework in K-NAT. This is related to the enhanced ion-exchange properties of K-NAT, which, in marked contrast to Na-NAT, permits the exchange of K+ by a variety of uni-, di-, and trivalent cations.",
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Role of cation-water disorder during cation exchange in small-pore zeolite sodium natrolite. / Lee, Yongmoon; Lee, Jun Sik; Kao, Chi Chang; Yoon, Ji Ho; Vogt, Thomas; Lee, Yongjae.

In: Journal of Physical Chemistry C, Vol. 117, No. 31, 08.08.2013, p. 16119-16126.

Research output: Contribution to journalArticle

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