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Keywords:

  • high-pressure chemistry;
  • ion exchange;
  • lanthanides;
  • X-ray diffraction;
  • zeolites
Thumbnail image of graphical abstract

High-pressure ion exchange of small-pore zeolite K-natrolite allows immobilization of nominally non-exchangeable aliovalent cations such as trivalent europium. A sample exchanged at 3.0(1) GPa and 250 °C contains about 4.7 EuIII ions per unit cell, which is equivalent to over 90 % of the K+ cations being exchanged (see picture).