Dehydrogenation of light alkanes over rhenium catalysts on conventional and mesoporous MFI supports

Anne Krogh Rovik, Anke Hagen, I. Schmidt, Søren Dahl, Ib Chorkendorff, Christina Hviid Christensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Recently, Re/HZSM-5 (Si/Al = 15) was shown to be an efficient catalyst for ethane dehydrogenation and aromatization at 823 K and atmospheric pressure. In this reaction, the major initial products were benzene, toluene and xylene (BTX), but increasing amounts of ethene were produced with time on stream due to deactivation of the catalyst. We show that by use of rhenium impregnated MFI supports with very few or no acidic sites (Si/Al > 500), highly selective ethane dehydrogenation catalysts are obtained with ethene selectivities of 98%. By use of mesoporous MFI supports (Si/Al > 500) the lifetime of the catalyst appears to be slightly improved compared to conventional MFI crystals. The beneficial effect of a mesoporous MFI support is convincingly demonstrated in propane dehydrogenation, where both conversion and selectivities on the mesoporous MFI (Si/Al > 500) impregnated with Re are significantly higher than on Re supported on a comparable conventional MFI support.
Original languageEnglish
JournalCatalysis Letters
Volume109
Issue number3-4
Pages (from-to)153-156
ISSN1011-372X
DOIs
Publication statusPublished - 2006

Keywords

  • mesoporous zeolites
  • MFI zeolites
  • rhenium
  • dehydrogenation of light alkanes

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