CO oxidation in the presence of hydrogen on Au/TiO2 catalyst: An FTIR-MS study

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Abstract

Oxidation of CO in the absence and in the presence of H2 was studied on TiO2 and 1% Au/TiO2 catalysts with the help of Fourier transform infrared spectroscopy and mass spectroscopy at 300-373 K. It was found that CO adsorbed on edged and kinked Au atoms are the active surface species for CO oxidation. Oxygen adsorbs on Au particles, too. Activation of hydrogen on the metallic part of the catalyst reduces the extent of CO oxidation. Formation of formaldehyde (both on the surface and in the gas phase) was observed, which also contributes to the decrease of the extent of CO oxidation. It was stated that Au/TiO2 catalyst - although it is very active in CO oxidation in the absence of hydrogen - is not appropriate for the preferential oxidation of CO in CO + O2 + H2 gas mixtures.

Original languageEnglish
Pages (from-to)87-95
Number of pages9
JournalCatalysis Letters
Volume111
Issue number1-2
DOIs
Publication statusPublished - Oct 2006

Fingerprint

Carbon Monoxide
Hydrogen
catalysts
Oxidation
oxidation
Catalysts
hydrogen
formaldehyde
Formaldehyde
Gas mixtures
Fourier transform infrared spectroscopy
gas mixtures
mass spectroscopy
Chemical activation
infrared spectroscopy
Spectroscopy
activation
vapor phases
Atoms
Oxygen

Keywords

  • CO adsorption
  • CO oxidation
  • Effect of H
  • FTIR
  • Mass spectrometry
  • TiO and Au/TiO catalysts

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

CO oxidation in the presence of hydrogen on Au/TiO2 catalyst : An FTIR-MS study. / Raskó, J.; Kiss, J.

In: Catalysis Letters, Vol. 111, No. 1-2, 10.2006, p. 87-95.

Research output: Contribution to journalArticle

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N2 - Oxidation of CO in the absence and in the presence of H2 was studied on TiO2 and 1% Au/TiO2 catalysts with the help of Fourier transform infrared spectroscopy and mass spectroscopy at 300-373 K. It was found that CO adsorbed on edged and kinked Au atoms are the active surface species for CO oxidation. Oxygen adsorbs on Au particles, too. Activation of hydrogen on the metallic part of the catalyst reduces the extent of CO oxidation. Formation of formaldehyde (both on the surface and in the gas phase) was observed, which also contributes to the decrease of the extent of CO oxidation. It was stated that Au/TiO2 catalyst - although it is very active in CO oxidation in the absence of hydrogen - is not appropriate for the preferential oxidation of CO in CO + O2 + H2 gas mixtures.

AB - Oxidation of CO in the absence and in the presence of H2 was studied on TiO2 and 1% Au/TiO2 catalysts with the help of Fourier transform infrared spectroscopy and mass spectroscopy at 300-373 K. It was found that CO adsorbed on edged and kinked Au atoms are the active surface species for CO oxidation. Oxygen adsorbs on Au particles, too. Activation of hydrogen on the metallic part of the catalyst reduces the extent of CO oxidation. Formation of formaldehyde (both on the surface and in the gas phase) was observed, which also contributes to the decrease of the extent of CO oxidation. It was stated that Au/TiO2 catalyst - although it is very active in CO oxidation in the absence of hydrogen - is not appropriate for the preferential oxidation of CO in CO + O2 + H2 gas mixtures.

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KW - Effect of H

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KW - Mass spectrometry

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