FTIR study of carbon monxide oxidation and scrambling at room temperature over gold supported on ZnO and TiO{sub 2} No. 2

Journal Article · Thu Feb 29 04:00:00 EST 1996 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/jp952259n· OSTI ID:226743

Boccuzzi, F; Chiorino, A ^[1]; Tsubota, Suzumu; Haruta, Masatake ^[2]

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1. Universita di Torino (Italy)
2. Osaka National Research Inst., Ikeda (Japan)

An FTIR and quadrupole mass spectroscopic study of CO adsorption and oxidation with {sup 16}O{sub 2} and {sup 18}O{sub 2} is presented together with coadsorption experiments of CO and water on gold supported on ZnO and TiO{sub 2}. The experimental results are closely related to those presented in the parallel paper on copper catalysts supported on the same oxides. The most important points are as follows: (i) CO is found to be activated on the metallic particles on two kinds of sites, the normal terrace sites and sites at the borderline of the particles; (ii) there is evidence that on the examined samples there are metallic sites which are able to adsorb both oxygen and carbon monoxide molecules at the same time; (iii) carbon dioxide and carbonate-like species are formed; the asymmetric stretching frequencies of CO{sub 2}, the quadrupole mass spectroscopic analysis, and the IR spectra analysis reveal that with {sup 18}O{sub 2}, different isotopic molecular CO{sub 2} is formed while the carbonate-like species have the same frequencies of those produced in {sup 16}O{sub 2}; (iv) there are two independent pathways for CO oxidation, a rapid direct oxidation of CO at the surface of the metallic particles and a slow induced oxidation with the surface lattice oxygen species of the supports; (v) evidence is found that CO-H{sub 2}O coadsorption experiments produce atomic hydrogen on Au/ZnO, not on Au/TiO{sub 2}. 23 refs., 6 figs.

• OSTI ID: 226743
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 9 Vol. 100; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ABSORPTION SPECTRA
ADSORPTION
CARBON MONOXIDE
CATALYSIS
CATALYSTS
GOLD
INFRARED SPECTRA
MASS SPECTRA
OXIDATION
TITANIUM OXIDES
ZINC OXIDES