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Comparison of Activity and Selectivity of SSZ-33 Based Catalyst with other Zeolites in Toluene Disproportionation

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Abstract

SSZ-33 based-catalyst, after modification with Mo and alumina binder, was evaluated in long-run tests in the toluene disproportionation in the presence of hydrogen as a carrier gas. The activity and selectivity of this catalyst were compared with those of ZSM-5 and mesoporous ZSM-5 prepared with the same concentration of Mo and alumina. Formation of the final catalysts decreased the void volume of micropores in order SSZ-33 > ZSM-5 > ZSM-5/Meso. Simultaneously, the concentration of Lewis acid sites increased due to the addition of alumina to the catalyst. The highest toluene conversion was achieved with SSZ-33 catalyst comprising 12-12-10-ring channels, which is the result of high acidity of this zeolite together with increased mass transport through large pores. ZSM-5 zeolite exhibited lower toluene conversion while only a low activity was found for mesoporous ZSM-5 probably due to the limitations of the access to the zeolite channels after modification with alumina.

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Acknowledgement

The authors thank Dr. S. I. Zones (Chevron) for providing SSZ-33 zeolite and supporting this work. The Support provided by The Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM) is appreciated. J. Čejka was supported by the Academy of Sciences of the Czech Republic (1QS400400560) while Z. Musilová-Pavlačková thanks the Grant Agency of the Czech Republic (203/08/H032) and Dr. L. Brabec for recording the SEM images.

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Authors and Affiliations

  1. Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, Saudi Arabia

    S. Al-Khattaf & M. A. Ali

  2. J. Heyrovský Institute of Physical Chemistry ASCR, v.v.i., Dolejškova 3, 182 23, Prague, Czech Republic

    Z. Musilová-Pavlačková & J. Čejka

Authors
  1. S. Al-Khattaf
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  2. Z. Musilová-Pavlačková
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  3. M. A. Ali
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  4. J. Čejka
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Correspondence to J. Čejka.

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Al-Khattaf, S., Musilová-Pavlačková, Z., Ali, M.A. et al. Comparison of Activity and Selectivity of SSZ-33 Based Catalyst with other Zeolites in Toluene Disproportionation. Top Catal 52, 140–147 (2009). https://doi.org/10.1007/s11244-008-9150-8

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  • DOI: https://doi.org/10.1007/s11244-008-9150-8

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