Olefin conversion over zeolite H-ZSM-5

Authors

  • G. W. Norval,

    1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 1A4
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  • M. J. Phillips,

    Corresponding author
    1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 1A4
    • Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 1A4
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  • K. S. Virk,

    1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 1A4
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  • R. V. Simons

    1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 1A4
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Abstract

The conversion of propene, 1-butene and 2-methylpropene over zeolite H-ZSM-5 has been studied in the temperature range 663–773 K. While propene and 1-butene yield similar products, that from 2-methylpropene contains less aromatics, but a greater fraction of xylenes. The time on stream behaviour of the aromatics from this latter olefin demonstrates that the difference in product yield and selectivity is due to pore mouth blockage resulting from the formation of iso-butyl cations on the external zeolite surface.

Abstract

Nous avons étudié la conversion du propène, du 1-butène et du 2-méthylpropène sur une zéolithe H-ZSM-5 à des températures comprises entre 663–773 K. Alors qu'on obtient des produits similaires avec le propène et le 1-butène, celui obtenu à partir du 2-méthylpropène contient moins d'aromatiques mais une fraction plus importante de xylènes. Le temps sur le comportement de circulation des aromatiques obtenus à partir de cette oléfie montre que la différence dans le rendement et la sélectivité est due au blocage de Fembouchure des pores provoqué par la formation de cations d'isobutyl à la surface externe de la zéolithe.

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