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

Ceramics-Silikáty 37, (3) 159 - 163 (1993)


THERMAL STABLE POROUS CRYSTALS FROM MONTMORILLONITE - II. PREPARATION AND THE PROPERTIES OF CR PILLARED MONTMORILLONITES
 
Krajčovič Jozef, Horváth Ivan, Grejták František
 
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava

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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