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Radial distribution studies of non-framework aluminium species formed during dehydroxylation of zeolite HY

Nature volume 315, pages 736–739 (1985)Cite this article

Abstract

The use of stabilized zeolite Y as a cracking catalyst for converting petroleum into gasoline, fuel oil and petrochemical feeds is widespread1. During the stabilization process, when the ammonium-exchanged form of zeolite Y is heated to high temperatures, aluminium is extracted from the zeolite framework1–3. The nature of this non-framework aluminium has been of considerable interest because of its possible influence on the zeolite acidity and thermal stability. Indirect information on the nature of the non-framework Al (NFA) has been obtained from infrared spectroscopy, X-ray diffraction, absorption and nuclear magnetic resonance (NMR) studies. To obtain further knowledge of the NFA species, we have now performed radial electron distribution studies of H–Y and H–Y dehydroxylated in vacuum and steam. These studies suggest that the non-framework Al species probably contain edge-shared octahedral Alm(O,OH)n chains similar to those found in NaAlSi2O6 (jadeite), CaAl2(OH)4SiO4 (chantalite) and Al2(OH)2TeO3SO4.

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Authors and Affiliations

  1. Central Research & Development Department, Experimental Station, E. I. du Pont de Nemours & Company, Wilmington, Delaware, 19898, USA

    R. D. Shannon

  2. Institut de Recherches sur la Catalyse, CNRS, 2, Ave Albert Einstein, 69626, Villeurbanne Cedex, France

    G. Bergeret & P. Gallezot

Authors
  1. R. D. Shannon
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  2. G. Bergeret
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  3. P. Gallezot
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Shannon, R., Bergeret, G. & Gallezot, P. Radial distribution studies of non-framework aluminium species formed during dehydroxylation of zeolite HY. Nature 315, 736–739 (1985). https://doi.org/10.1038/315736a0

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