ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 36, (1) 31 - 38 (1992)


HYDROTHERMAL PREPARATION OF VANADIUM ZEOLITES
 
Dubanská Věra
 
Geological Institute of the Czechoslovak Academy of Sciences, Rozvojová 135, 165 00 Prague, Czechoslovakia

The study was concerned with hydrothermal alterations of synthetic vanadium glasses with a verying ratio of the oxides SiO₂ : Al₂O₃ : V₂O₅, for the purpose of determining the possibility of building the vanadium atoms into the zeolitic structure. The hydrothermal decomposition of the glasses was effected in three - to eight-day cycles at 120°C in the medium of basic solutions of hydroxides or salts with a sodium or potassium cation. In this way, a series of zeolites was prepared whose properties depended on the composition of the initial glasses, in particular on their SiO₂ : Al₂O₃ ratio. The vanadium content in the zeolites was determined. The highest content was found in zeolite Nu-15 having the composition Na₂O : Al₂O₃ : 3SiO₂ 0.5 V₂O₅ (in anhydrous form). A significant content of vanadium was also found in analcime and a substantially lower one in synthetic zeolites A and KF. Zeolites of the phillipsite type contained no vanadium at all.


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