Conversion of methanol to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI: Major differences in deactivation behavior

Uffe Vie Mentzel, Karen Thrane Højholt, Martin Spangsberg Holm, Rasmus Fehrmann, Pablo Beato

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Abstract

Methanol has been converted to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI. The gallium based zeotypes are analogous to H-ZSM-5, but the Brønsted acidity is introduced by framework incorporation of gallium rather than aluminum, which leads to lower intrinsic acid strength. In the methanol-to-hydrocarbons (MTH) process, H-ZSM-5 is subjected to coke formation leading to catalyst deactivation. Here we show that when the gallium containing zeotypes are employed in the MTH process, only insignificant amounts of coke are present in the deactivated catalysts, indicating distinct differences in deactivation mechanisms of the two different catalysts. This is investigated further through FT-IR measurements as well as catalytic experiments employing regenerated and steamed catalysts. From this it is concluded that the H-Ga-MFI is subjected to irreversible deactivation by steaming (hydrolysis) of the Ga&sbnd;O bonds in the zeolite structure rather than coke deposition.
Original languageEnglish
JournalApplied Catalysis A: General
Volume417-418
Pages (from-to)290-297
ISSN0926-860X
DOIs
Publication statusPublished - 2012

Keywords

  • Gallium
  • Regeneration
  • Zeolite
  • Deactivation
  • Methanol-to-hydrocarbons (MTH)

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