Ceramics-Silikáty 37, (3) 159 - 163 (1993) |
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THERMAL STABLE POROUS CRYSTALS FROM MONTMORILLONITE - II. PREPARATION AND THE PROPERTIES OF CR PILLARED MONTMORILLONITES
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Krajčovič Jozef, Horváth Ivan, Grejták František
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Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava
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Chromium pillared montmorillonites were prepared by cation exchange reaction of Na and Ca Jelšový Potok montmorillonite with hydroxy-chromium solution and by subsequent calcination, when oxide pillars in interlayer space were formed. Solution of Cr polymer cations was obtained by aging of Cr(NO₃)₃ solution titrated by Na₂CO₃ with final molar ratio (OH)/(Cr) = 2. Thermal, XRD and IR spectroscopy methods were used to investigate prepared materials. A higher oxidation ability of Cr pillared sample in comparison with Na and Al pillared-montmorillonite was shown in thermal measurements after p-xylene adsorption. |
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