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Paper Information

Journal:   JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)   SUMMER 2007 , Volume 33 , Number 2 (SECTION: CHEMISTRY); Page(s) 39 To 45.
 
Paper: 

PHASE TRANSITION OF NATURAL CLINOPTILOLITE TO ANALCIME AT PRESENCE OF ALKALINE SOLUTION

 
 
Author(s):  TOUTI F.*, KHARAMESH M., BADIEI A.R., BARGHI MOHAMMAD ALI
 
* SCHOOL OF GEOLOGY, UNIVERSITY COLLEGE OF SCIENCES, UNIVERSITY OF TEHRAN, TEHRAN, IRAN
 
Abstract: 

Clinoptiloite transforms to analcime under hydrothermal condition in presence of alkaline fluids. The effect of Na+ and K+ concentrations, temperature and run duration are being considered as the variable parameters in the present study. Alkaline solutions were used in concentration of 1.25 up to 7.5mol/lit under temperatures of 100 and 150˚C. Results of this study show that analcime is synthesized at 150ºC and high concentration of Na+. With increasing Na+ content of the fluids and reaction time, the amount of analcime increases drastically.  Powder X-ray diffraction study has revealed an orthorhombic symmetry with the unit-cell parameter of a: 13.731 Å, b: 13.726 Å, c: 13.769 Å.

 
Keyword(s): CLINIPTILOLITE, ANALCIME, HYDROTHERMAL SYNTHESIS, ALKALINE SOLUTION
 
References: 
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