Adsorption and reactions of ethanol and ethanol-water mixture on alumina-supported Pt catalysts

M. Dömök, M. Tóth, J. Raskó, A. Erdóhelyi

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

The formation of surface species in the ethanol-water interaction and the reforming of ethanol have been investigated on Pt/Al2O3 catalysts and for comparison on the support. By means of infrared spectroscopy it was found that on Pt/Al2O3 not only adsorbed ethanol, different types of ethoxy species but also traces of acetaldehyde and a significant amount of acetate groups were detectable on the surface. The latter species were stable even at 700 K. The gas phase analysis of the ethanol-dosed surface showed at higher temperature considerable amount of ethylene in the case of Al2O3 and hydrogen in the case of Pt/Al2O3. In the ethanol + water reaction the selectivity of H2 and CO2 formation at 723 K decreased in time, while that of ethylene increased. This trend was attenuated by increasing the following parameters: water concentration, metal loading and reaction temperature. It was assumed that this behavior of Pt/Al2O3 in the ethanol + water reaction can be attributed to the formation of surface acetate groups which hindered the reaction on the metal, although these species were located rather on the support.

Original languageEnglish
Pages (from-to)262-272
Number of pages11
JournalApplied Catalysis B: Environmental
Volume69
Issue number3-4
DOIs
Publication statusPublished - Jan 15 2007

Fingerprint

Aluminum Oxide
Catalyst supports
aluminum oxide
ethanol
Ethanol
Alumina
catalyst
adsorption
Adsorption
Water
water
ethylene
acetate
Ethylene
Acetates
Metals
Acetaldehyde
acetaldehyde
metal
Reforming reactions

Keywords

  • Acetate formation
  • Ethanol dehydration
  • Ethanol dehydrogenation
  • Pt/AlO catalyst
  • Steam reforming of ethanol
  • Surface ethoxide

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Chemistry

Cite this

Adsorption and reactions of ethanol and ethanol-water mixture on alumina-supported Pt catalysts. / Dömök, M.; Tóth, M.; Raskó, J.; Erdóhelyi, A.

In: Applied Catalysis B: Environmental, Vol. 69, No. 3-4, 15.01.2007, p. 262-272.

Research output: Contribution to journalArticle

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