Methanol to hydrocarbons: enhanced aromatic formation using composite group 13 oxide/H-ZSM-5 catalysts

D Freeman, R P K Wells, G J Hutchings

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13 Citations (Scopus)

Abstract

The conversion of methanol to hydrocarbons using composite catalysts comprising physical mixtures of the zeolite H-ZSM-5 with group 13 oxides (gamma-Al2O3, beta-Ga2O3, In2O3, Tl2O3) is reported and discussed. The addition of beta-Ga2O3 at 400degreesC gives a marked enhancement in the yield of C-8 and C-9 aromatic compounds, whereas the addition of gamma-Al2O3 has no effect and both the In2O3/H-ZSM-5 and Tl2O3/H-ZSM-5 are inactive. At 300degreesC, a marked enhancement in the yield of aromatic hydrocarbons is observed for beta-Ga2O3 and In2O3, and a less marked enhancement is observed with Tl2O3 and gamma-Al2O3. In particular, the addition of In2O3 to H-ZSM-5 as a simple physical mixture gives a significant enhancement in catalyst activity at 300degreesC. The effect of the Si:Al atomic ratio of H-ZSM-5 is also investigated for the beta-Ga2O3/H-ZSM-5 ratio is dependent upon the Si:Al ratio. Pretreatment or co-feeding of hydrogen decreases the yield of the aromatic products. The results are explained in terms of an active site formed by the interaction between the oxide and the zeolite.

Original languageEnglish
Pages (from-to)217-225
Number of pages9
JournalCatalysis Letters
Volume82
Issue number3-4
DOIs
Publication statusPublished - Oct 2002

Keywords

  • promotion in heterogeneous catalysis
  • methanol conversion
  • aromatic hydrocarbon synthesis
  • H-ZSM-5
  • group 13 oxides
  • beta-Ca theta O-2(3)/H-ZSM-5 composite catalysts
  • O-compounds
  • conversion
  • mordenite
  • ethylene
  • state
  • life

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