W. Lutz, D. Heidemann, C. H. Rüscher, J.-Chr. Buhl: Formation of Alkali-Aluminosilicate Layers on Thermochemically Dealuminated Y Zeolites by Alkaline Leaching

Crystal Research and Technology

Cryst. Res. Technol. 36 (2001) 9 - Abstract -

W. Lutz, D. Heidemann, C. H. Rüscher*, J.-Chr. Buhl*

WITEGA - Angewandte Werkstoff-Forschung g.GmbH, Berlin, Germany
*Institut für Mineralogie, Universität Hannover, Hannover, Germany

Formation of Alkali-Aluminosilicate Layers on Thermochemically Dealuminated Y Zeolites by Alkaline Leaching

Zeolite Y was steamed at 873 K for 7 h. This thermochemical treatment increases the Si/Al ratio of the zeolite framework from 2.4 to 3.8 under the formation of non-framework aluminium species. Successive leaching in 0.25 M KOH at 353 K for 24 h decreases the Si/Al ratio of the zeolite to 2.6 due to the formation of a X-ray amorphous potassium aluminosilicate surface layer.

Keywords: zeolite, dealumination, realumination, alkaline leaching

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