Alkali metal cation equilibria with chabazite

  • Ames L
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Abstract

Chabazite ion-exchange equilibria for Na-K, Na-Cs, and Cs-K at 23 degrees C were studied. The Gibbs free-energy change derived from the isotherm for the reaction Na (zeolite)+K (solution)=K (zeolite)+Na (solution) is +1.57 kcal, in good agreement with Barrer's values. Only 85 percent of the 3.53 Na atoms per unit cell is present in the equilibrium exchanged Cs chabazite; this is explicable in terms of the crystal structure proposed by Smith.

Author-supplied keywords

  • Cs-K
  • Cs-K equilibria in chabazite
  • Exchange constants and free energy change
  • Ion exchange and crystal structure
  • Na-Cs
  • Na-K
  • chabazite
  • change in ion exchange
  • crystal chemistry
  • framework silicates
  • free energy
  • geochemistry
  • ion exchange
  • ion-exchange equilibria
  • mineral data
  • phase equilibria
  • silicates
  • thermodynamic properties
  • zeolite group

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Authors

  • L.L. Jr. Ames

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