Phase Transition of Natural Clinoptiloite to Phillipsite at Presence of Alkaline Solution

Abstract

Clinoptiloite transforms to phillipsite under hydrothermal conditions in the presence of alkaline fluids. The effect of Na+ and K+ concentrations, temperature and time are the variable parameters in the present study. Alkaline solutions of KOH and NaCl were used in concentrations of 1.25 up to 7.5mol/lit at temperatures of 100 and 150 ˚C. Results of this study show that phillipsite has been synthesized at 100 and 150 ºC and high concentration of K+ at the expense of clinoptilolite dissolution. With increasing K+ content of the fluids and reaction time, the amount of phillipsite increases drastically.  Powder X-ray diffraction study has revealed a monoclinic (pseudo-orthorhombic) symmetry with the unit-cell parameters as follows for phillipsite: a: 10.104 Å, b: 14.305 Å, c: 14.618 Å, β: 91.401º.

Keywords

References

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History

  • Receive Date: 02 July 2025
  • Revise Date: 04 February 2026
  • Accept Date: 02 July 2025

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