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

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.