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Shape selectivity of hydrothermally treated H-ZSM-5 in toluene disproportionation and xylene isomerization

✍ Scribed by U. Kürschner; H.-G. Jerschkewitz; E. Schreier; J. Völter

Publisher: Elsevier Science
Year: 1990
Weight: 723 KB
Volume: 57
Category: Article
ISSN: 0166-9834
DOI: 10.1016/s0166-9834(00)80730-7

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✦ Synopsis

Controlled hydrothermal treatment of H-ZSM-5 at 500°C causes a transformation of framework into non-framework aluminium, as indicated by means of cation exchange and IR spectroscopy. After treatment with nitric acid, partial extraction of non-framework aluminium was observed. The non-framework aluminium-containing samples showed an enhanced p-xylene selectivity in the catalytic disproportionation of toluene and in the isomerization of m-xylene. The subsequently extracted samples had lost this property. A model of the decisive role of nonframework aluminium in shape selectivity is discussed.

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