Diode laser absorption study of internal energies of CO2produced from catalytic CO oxidation
| Autor: | Steven L. Bernasek, Daniel J. Bald, Ralf Kunkel |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Tunable diode laser absorption spectroscopy
Absorption spectroscopy Analytical chemistry General Physics and Astronomy chemistry.chemical_element chemistry Molecular vibration Physics::Chemical Physics Physical and Theoretical Chemistry Platinum Absorption (electromagnetic radiation) Vibrational temperature Tunable laser Excitation |
| Zdroj: | The Journal of Chemical Physics. 104:7719-7728 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.471477 |
| Popis: | Internal energy distributions for CO2 molecules produced in the catalytic oxidation of CO by O2 on polycrystalline platinum have been directly measured using a high resolution tunable diode laser (TDL) spectrometer. Absorption spectra have been collected for CO2 produced in a flow cell reactor for a wide range of temperatures and reactant ratios. Vibrational energies for CO2 produced under most reaction conditions are greater than would be expected from complete equilibration with the surface. The asymmetric stretching mode consistently exhibited a higher vibrational Boltzmann ‘‘temperature’’ than the bending or symmetric stretching modes. The level of vibrational excitation for all of the vibrational modes was sensitive to oxygen coverage, i.e, as either the O2:CO reactant ratio or the surface temperature is increased, the vibrational temperature of the product CO2 increases significantly. |
| Databáze: | OpenAIRE |
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