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

All Science Journal Classification (ASJC) codes

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

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