The Conversion of methanol to hydrocarbons over Ga2O5-HZSM-5 and Ga2O5-WO3 catalysts

D. Freeman, Richard Peter Kerwin Wells, G. J. Hutchings

Research output: Contribution to journalArticle

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Abstract

The conversion of methanol over physical mixtures of Ga2O3 and H-ZSM-5 or WO3/gamma-Al2O3 is reported. The addition of Ga2O3 to H-ZSM-5 markedly increases the selectivity to aromatic hydrocarbon at the expense Of C-2-C-4 alkenes, without affecting the overall conversion. This effect is obtained at temperatures greater than or equal to400degreesC, and the maximum effect is observed at 1:1 mixtures of Ga2O3 and H-ZSM-5. Experiments using separate beds of Ga2O3 and H-ZSM-5 with different configurations do not reveal any significant effect. In addition, upon removal of Ga2O3 from the Ga2O3/H-ZSM-5 physical mixture the normal catalytic performance of the zeolite is observed. Ga2O3 is also shown to significantly enhance the catalytic activity of a WO3/gamma-Al2O3 catalyst when it is incorporated as a physical mixture. The results are explained in terms of a new active site that is formed at the point of contact between Ga2O3 and H-ZSM-5 or WO3/gamma-Al2O3 particles. In the case of H-ZSM-5/beta-Ga2O3, this site catalyzes the formation of aromatic products from C-2-C-5 alkenes, whereas for WO3/gamma-Al2O3:beta-Ga2O3 the new site catalyzes the formation of methane. (C) 2002 Elsevier Science.

Original languageEnglish
Pages (from-to)358-365
Number of pages7
JournalJournal of Catalysis
Volume205
DOIs
Publication statusPublished - 2002

Keywords

  • methanol conversion to hydrocarbons
  • contact synergy
  • Ga2O3/H-ZSM-5 catalyst
  • Ga2O3/WO3 catalyst
  • ANGLE-SPINNING NMR
  • CARBON-CARBON BOND
  • C-C BOND
  • DIMETHYL ETHER
  • ZSM-5 ZEOLITE
  • REACTION-MECHANISM
  • O-COMPOUNDS
  • ETHYLENE
  • H-ZSM-5
  • SPECTROSCOPY

Cite this

The Conversion of methanol to hydrocarbons over Ga2O5-HZSM-5 and Ga2O5-WO3 catalysts. / Freeman, D.; Wells, Richard Peter Kerwin; Hutchings, G. J.

In: Journal of Catalysis, Vol. 205, 2002, p. 358-365.

Research output: Contribution to journalArticle

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T1 - The Conversion of methanol to hydrocarbons over Ga2O5-HZSM-5 and Ga2O5-WO3 catalysts

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AU - Wells, Richard Peter Kerwin

AU - Hutchings, G. J.

PY - 2002

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N2 - The conversion of methanol over physical mixtures of Ga2O3 and H-ZSM-5 or WO3/gamma-Al2O3 is reported. The addition of Ga2O3 to H-ZSM-5 markedly increases the selectivity to aromatic hydrocarbon at the expense Of C-2-C-4 alkenes, without affecting the overall conversion. This effect is obtained at temperatures greater than or equal to400degreesC, and the maximum effect is observed at 1:1 mixtures of Ga2O3 and H-ZSM-5. Experiments using separate beds of Ga2O3 and H-ZSM-5 with different configurations do not reveal any significant effect. In addition, upon removal of Ga2O3 from the Ga2O3/H-ZSM-5 physical mixture the normal catalytic performance of the zeolite is observed. Ga2O3 is also shown to significantly enhance the catalytic activity of a WO3/gamma-Al2O3 catalyst when it is incorporated as a physical mixture. The results are explained in terms of a new active site that is formed at the point of contact between Ga2O3 and H-ZSM-5 or WO3/gamma-Al2O3 particles. In the case of H-ZSM-5/beta-Ga2O3, this site catalyzes the formation of aromatic products from C-2-C-5 alkenes, whereas for WO3/gamma-Al2O3:beta-Ga2O3 the new site catalyzes the formation of methane. (C) 2002 Elsevier Science.

AB - The conversion of methanol over physical mixtures of Ga2O3 and H-ZSM-5 or WO3/gamma-Al2O3 is reported. The addition of Ga2O3 to H-ZSM-5 markedly increases the selectivity to aromatic hydrocarbon at the expense Of C-2-C-4 alkenes, without affecting the overall conversion. This effect is obtained at temperatures greater than or equal to400degreesC, and the maximum effect is observed at 1:1 mixtures of Ga2O3 and H-ZSM-5. Experiments using separate beds of Ga2O3 and H-ZSM-5 with different configurations do not reveal any significant effect. In addition, upon removal of Ga2O3 from the Ga2O3/H-ZSM-5 physical mixture the normal catalytic performance of the zeolite is observed. Ga2O3 is also shown to significantly enhance the catalytic activity of a WO3/gamma-Al2O3 catalyst when it is incorporated as a physical mixture. The results are explained in terms of a new active site that is formed at the point of contact between Ga2O3 and H-ZSM-5 or WO3/gamma-Al2O3 particles. In the case of H-ZSM-5/beta-Ga2O3, this site catalyzes the formation of aromatic products from C-2-C-5 alkenes, whereas for WO3/gamma-Al2O3:beta-Ga2O3 the new site catalyzes the formation of methane. (C) 2002 Elsevier Science.

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KW - Ga2O3/WO3 catalyst

KW - ANGLE-SPINNING NMR

KW - CARBON-CARBON BOND

KW - C-C BOND

KW - DIMETHYL ETHER

KW - ZSM-5 ZEOLITE

KW - REACTION-MECHANISM

KW - O-COMPOUNDS

KW - ETHYLENE

KW - H-ZSM-5

KW - SPECTROSCOPY

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DO - 10.1006/jcat.2001.3446

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EP - 365

JO - Journal of Catalysis

JF - Journal of Catalysis

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ER -