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A CO2 surface molecular precursor during CO oxidation over Pt{100}
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UNSPECIFIED (2004) A CO2 surface molecular precursor during CO oxidation over Pt{100}. JOURNAL OF PHYSICAL CHEMISTRY B, 108 (38). pp. 14270-14275. doi:10.1021/jp0497918 ISSN 1520-6106.
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Official URL: http://dx.doi.org/10.1021/jp0497918
Abstract
Using different isotopologues of the reactant gases CO and O-2, infrared reflection absorption spectroscopy (IRAS) has been used to investigate the transient surface species on the Pt{100} surface under reaction conditions which was first shown to give rise to an absorption band around 1630 cm(-1) by Hong and Richardson (J. Phys. Chem. 1993, 97, 1258). The results show that this band cannot be attributed to a C-O stretching frequency of the CO from the gas-phase incorporated into a CO-O surface complex, such as that identified as the transition state in recent density-functional theory (DFT) calculations of the Pt{111}/CO + O-2 and Pt{100}/CO + NO reactions. The IRAS results are consistent, however, with a surface O-C-O species of low symmetry in which the IR band is due to a C-O stretching mode involving an O atom arising from the molecular O-2, and estimates of the desorption energy of this species show it is chemisorbed. This surface intermediate may also be involved in the CO + NO oxidation reaction over Pt{100}, but the steady-state coverage at the higher reaction temperature would preclude its observation in IRAS. The results suggest that further DFT calculations exploring alternative reaction paths may be of value.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | JOURNAL OF PHYSICAL CHEMISTRY B | ||||
Publisher: | AMER CHEMICAL SOC | ||||
ISSN: | 1520-6106 | ||||
Official Date: | 23 September 2004 | ||||
Dates: |
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Volume: | 108 | ||||
Number: | 38 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 14270-14275 | ||||
DOI: | 10.1021/jp0497918 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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