International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

REDUCED CHARGE Al-PILLARED MONTMORILLONITES: ON THE POSSIBILITY OF CONTROLLING THE PILLAR DENSITY

Pages: 99 - 102

Authors: KRZYSZTOF BAHRANOWSKI, ADAM GAWEL, ANDRZEJ KIELSKI, ALICJA MICHALIK, EWA M. SERWICKA, EWA WISLA-WALSH, KRYSTYNA WODNICKA, CHRISTOPH ZWICKY

Abstract: The microporosity of Al-pillared Li-montmorillonites with different layer charges obtained by thermal treatment at different temperatures was studied by nitrogen adsorption/desorption at -196 °C. A correlation was observed between the decreasing sorption capacity of samples derived from lithiated precursors heated at ever increasing temperature and the increasing contribution of the collapsed pyrophyllite-like areas inactive in pillaring. The dominant micropore radius remained below 3.5×10–1 nm for all pillared samples, showing that, contrary to the common belief, the layer charge reduction by Hofmann-Klemen effect fails to bring about substantial changes in the lateral interpillar distances.

Keywords: porosity, nitrogen adsorption/desorption, pillar density, pillared clay, lithiation, reduced charge montmo-rillonite

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Volume 53 no. 2 / April 2002

Volume 53 no. 2