METHOD OF INTERCALATION OF PEROVSKITIC PARTICLES IN THE FORM OF PILLARS INTO LAYERED CLAYS

摘要

With the proposed method it has been achieved the intercalation of perovskitic micro particles of the general type ABOx, where A is La or other suitable for perovskite structure cation usually a non-reductable while B is a usually reducible metallic cation, into aluminosilicate layered clay, of the type of smectites and especially into Montmorillonite. The method of intercalation proceeds through the synthesis of binuclear complexes of the general formula AB(fsaen) NO3. These complexes are adsorbed into the clay and occupy the space between the aluminosilicate layers. After adsorption the obtained system AB(fsaen)-Montmorillonite is heated and the organic part of the complex cation is burned and removed as volatile products leaving back between the layers of the clay (Montmorillonite) pillars of perovskitic nature ABO3 like for example LaCoO3, LaMnO3, LaNiO3 and LaCuO3. The final products appear high specific surface areas 200-250m2/gr at T=500=600 °C. The interlayer distances between the aluminosilicate sheets are about 16A at 500 °C and 13-14 Å at 600 °C which explains their high surface area. The thermal stability of such materials at high enough temperature of (600-700 °C) makes them potential candidates for use as adsorbents or absorbents as well as heterogeneous catalysts for different industrial applications.