Kinetics measurements of CO photo-oxidation on Pt(111).
- Resource Type
- Article
- Authors
- Tripa, C. Emil; Arumaninayagam, Christopher R.; Yates, John T.
- Source
- Journal of Chemical Physics. 7/22/1996, Vol. 105 Issue 4, p1691. 6p.
- Subject
- *CHEMICAL kinetics
*CARBON monoxide
*CHEMISORPTION
*PLATINUM
- Language
- ISSN
- 0021-9606
The photoactivation of chemisorbed O2 in the presence of chemisorbed CO on Pt(111) has been investigated for uv light in the range 3.87–4.77 eV (260–320 nm). Three photoprocesses first-order in O2 coverage have been separated and for the first time the cross sections for each are reported. The dominant process is O2 photodissociation (Qdiss=4.0±0.1×10-21 cm2). The second most probable process is photodesorption (Qdes=2.2±0.1×10-21 cm2). The least probable process is photoreaction with chemisorbed CO (Qrxn=0.35±0.03×10-21 cm 2). Previous studies of Qrxn have reported cross sections as high as 5×10-17 cm2. © 1996 American Institute of Physics. [ABSTRACT FROM AUTHOR]