TRANSFORMATION OF NATURAL ANALCIME AND PHILLIPSITE DURING THEIR HYDROTHERMAL RECRYSTALLIZATION INTO ZEOLITES A AND X.
Journal Title: International Journal of Advanced Research (IJAR) - Year 2019, Vol 7, Issue 2
Abstract
The objective of the present work was to study transformation of Georgian natural zeolites, analcime and phillipsite, during their recrystallization in the aim to obtain zeolites A and X, widely used for adsorption, separation, ion exchange and catalysis. It is found that phase-pure zeolite NaA (Na11.25(25) (K,?Ca,?Mg)0.7(1) (Al11.95(25)Si12.3(3)O48).18H2O) can be prepared in the form of cubic/rhombus crystallites with uniform micrometric (3-5 μm) dimensions by hydrothermal crystallization (95oC) of aged (72 hr) at room temperature gel (4.5Na2O: 0.45Al2O3: 1SiO2: 178H2O) obtained from natural analcime, treated with hydrochloric acid before suspending in water and mixing with sodium hydroxide. Phase-pure zeolite NaX (|Na66(3) [K,?Ca,?Mg,?Cu,?Zn]12(1) (H2O)248(10)| (Al78(3)Si114(4)O384)) with specific surface area of 589 m2/g and total pore volume of 0.578 cm3/g can be prepared in the form of octahedral crystallites with uniform micrometric (2-7 μm) dimensions by hydrothermal crystallization (95oC) of aged (96 hr) at room temperature gel (2.9Na2O: 0.26Al2O3: 1SiO2: 150H2O) obtained from water suspension of natural phillipsite, treated with hydrochloric acid and mixed with sodium hydroxide. The resulting zeolites in their characteristics are competitive with commercially available materials.
Authors and Affiliations
Vladimer Tsitsishvili, Nanuli Dolaberidze, Nato Mirdzveli, Tekla Kapanadze, Ketevan Virsaladze.
Keywords
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- EP ID EP482993
- DOI 10.21474/IJAR01/8479
- Views 61
- Downloads 0
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