FT-IR and mass spectrometric studies on the interaction of acetaldehyde with TiO2-supported noble metal catalysts

J. Raskó, T. Kecskés, J. Kiss

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Surface species formed during the adsorption of acetaldehyde at 300-673 K on TiO2-supported Pt, Rh and Au catalysts were investigated by Fourier transform infrared spectroscopy. Two forms of molecularly adsorbed acetaldehyde-H-bridge bonded on surface OH groups and adsorbed on Lewis sites through one of the oxygen lone pairs-were identified. β-aldolization of acetaldehyde led to the formation of crotonaldehyde, which adsorbs on Lewis sites of TiO2 through one of the oxygen lone pairs and on metallic sites via the C atom of the aldehyde group. Adsorbed acetaldehyde can be oxidized into surface acetate and it can be reduced resulting in adsorbed ethoxy. Mass spectroscopic analysis of the gas phase composition revealed that the formation of gas phase products (crotonaldehyde, water, benzene, hydrogen, ethylene, acetylene and methane) depends on the nature of the metals and the reaction temperature. An attempt was made to find a possible link between the surface species and the formation of the primary gas phase products.

Original languageEnglish
Pages (from-to)244-251
Number of pages8
JournalApplied Catalysis A: General
Volume287
Issue number2
DOIs
Publication statusPublished - Jun 22 2005

Fingerprint

2-butenal
Acetaldehyde
Precious metals
Catalysts
Gases
Oxygen
Acetylene
Spectroscopic analysis
Methane
Benzene
Aldehydes
Phase composition
Fourier transform infrared spectroscopy
Hydrogen
Ethylene
Acetates
Metals
Adsorption
Atoms
Water

Keywords

  • Acetaldehyde adsorption
  • Au catalysts
  • FT-IR
  • Gas phase products
  • MS
  • Rh
  • Surface species
  • TiO-supported Pt

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

FT-IR and mass spectrometric studies on the interaction of acetaldehyde with TiO2-supported noble metal catalysts. / Raskó, J.; Kecskés, T.; Kiss, J.

In: Applied Catalysis A: General, Vol. 287, No. 2, 22.06.2005, p. 244-251.

Research output: Contribution to journalArticle

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N2 - Surface species formed during the adsorption of acetaldehyde at 300-673 K on TiO2-supported Pt, Rh and Au catalysts were investigated by Fourier transform infrared spectroscopy. Two forms of molecularly adsorbed acetaldehyde-H-bridge bonded on surface OH groups and adsorbed on Lewis sites through one of the oxygen lone pairs-were identified. β-aldolization of acetaldehyde led to the formation of crotonaldehyde, which adsorbs on Lewis sites of TiO2 through one of the oxygen lone pairs and on metallic sites via the C atom of the aldehyde group. Adsorbed acetaldehyde can be oxidized into surface acetate and it can be reduced resulting in adsorbed ethoxy. Mass spectroscopic analysis of the gas phase composition revealed that the formation of gas phase products (crotonaldehyde, water, benzene, hydrogen, ethylene, acetylene and methane) depends on the nature of the metals and the reaction temperature. An attempt was made to find a possible link between the surface species and the formation of the primary gas phase products.

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