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The Effect of Zeolite Structure on the Activity and Selectivity in p-Xylene Alkylation with Isopropyl Alcohol

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Abstract

The effect of zeolite architecture and channel dimensionality on p-xylene conversion and selectivity to 1-isopropyl-2,5-dimethyl-benzene was investigated in p-xylene alkylation with isopropyl alcohol over novel zeolites SSZ-33 and SSZ-35. Catalytic behavior of these zeolites was compared with those of zeolites Beta, mordenite, ZSM-11 and ZSM-5. It was found that p-xylene conversion increases with increasing pore size and connectivity of the channel system of individual zeolites with the exception of SSZ-35, which possesses a system of one-dimensional 10-ring channels that periodically open into wide, shallow cavities circumscribed by 18-rings. SSZ-35 exhibited the highest conversion among all zeolites at the reaction temperature of 150 °C and also the highest selectivity to 1-isopropyl-2,5-dimethyl-benzene. Molecular modeling confirmed the dimensions of the 18-ring cages are optimal for the formation of this alkylation product.

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Notes

  1. Cerius2, V. 2.1, Product of MSI and Biosym.

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Acknowledgments

J.Č. thank the Academy of Sciences of the Czech Republic (1QS400400560) for financial support. The work of Z. M-P. was provided by the Grant Agency of the Czech Republic (203/08/032H). The authors also appreciate the support of this work by Chevron.

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Authors and Affiliations

  1. J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic

    Zuzana Musilová-Pavlačková, Martin Kubů, Martina Bejblová & Jiří Čejka

  2. Chevron Energy and Technology Company, Richmond, CA, 94802, USA

    Allen W. Burton & Stacey I. Zones

Authors
  1. Zuzana Musilová-Pavlačková
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  2. Martin Kubů
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  3. Allen W. Burton
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  4. Stacey I. Zones
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  5. Martina Bejblová
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  6. Jiří Čejka
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Corresponding author

Correspondence to Jiří Čejka.

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Musilová-Pavlačková, Z., Kubů, M., Burton, A.W. et al. The Effect of Zeolite Structure on the Activity and Selectivity in p-Xylene Alkylation with Isopropyl Alcohol. Catal Lett 131, 393–400 (2009). https://doi.org/10.1007/s10562-009-0039-3

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  • DOI: https://doi.org/10.1007/s10562-009-0039-3

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