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Initial activity/selectivity of H-gallosilicate (MFI) in propane aromatization: influence of H+ exchange and thermal/hydrothermal pretreatments

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Abstract

Initial activity/selectivity of H-gallosilicate (MFI) zeolite with different degrees of H+ exchange and pretreated under different thermal and hydrothermal conditions in propane aromatization (at 500‡C) has been determined using a pulse microreactor connected to GC. It is found to be strongly influenced by the degree of H+ exchange, calcination temperature and hydrothermal treatment at different temperatures and concentrations of steam. There exists a close relationship between the acidity (measured in terms of pyridine chemisorbed at 400‡ C) of the gallosilicate and its initial propane conversion and aromatization activity. Presence of strong acidic sites (attributed to FW Ga) at high concentration is essential for the well dispersed non-FW Ga oxide species to be active for dehydrogenation in the propane aromatization over the zeolite.

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Authors and Affiliations

  1. Chemical Engineering Division, National Chemical Laboratory, 411 008, Pune, India

    V. R. Choudhary, A. K. Kinage, C. Sivadinarayana & S. D. Sansare

  2. URA CNRS-350, Catalyse en Chimie Organique, Université de Poitiers, 40 Avenue du Recteur Pineau, 86022, Poitiers Cedex, France

    M. Guisnet

Authors
  1. V. R. Choudhary
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  2. A. K. Kinage
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  3. C. Sivadinarayana
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  4. S. D. Sansare
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  5. M. Guisnet
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Choudhary, V.R., Kinage, A.K., Sivadinarayana, C. et al. Initial activity/selectivity of H-gallosilicate (MFI) in propane aromatization: influence of H+ exchange and thermal/hydrothermal pretreatments. Catal Lett 33, 401–412 (1995). https://doi.org/10.1007/BF00814242

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  • DOI: https://doi.org/10.1007/BF00814242

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