Laboratory investigation of the photooxidation of formaldehyde combining FTIR analysis of stable species and HO2 detection by the chemical amplifier technique
| Autor: | Jean-François Doussin, P. Carlier, Stéphanie Pinceloup, G. Laverdet, Francoise Maguin, Georges Le Bras |
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| Rok vydání: | 2003 |
| Předmět: |
Absorption spectroscopy
Chemistry General Chemical Engineering Radical Thermal decomposition Photodissociation Formaldehyde Analytical chemistry General Physics and Astronomy Infrared spectroscopy General Chemistry chemistry.chemical_compound Reaction rate constant Fourier transform infrared spectroscopy |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 157:275-281 |
| ISSN: | 1010-6030 |
| Popis: | The photodissociation of formaldehyde in air at one atmosphere pressure and room temperature has been investigated in a 977 L photoreactor by in situ analysis of stable species by FTIR absorption spectroscopy and of peroxy radicals, HO 2 , by the chemical amplifier technique, after sampling. The photodissociation coefficient of the channel H 2 CO+ hν (+O 2 ) → 2 HO 2 +CO (1) determined experimentally was found consistent with that calculated from the absorption spectrum of H 2 CO and the spectral distribution of the photolysis light. The rate constant k −3 of the thermal decomposition of the adduct formed in the reaction HO 2 +H 2 CO↔HOCH 2 O 2 (3, −3) was determined and found at the lower limit of the range of the literature values. This study confirms the potentiality of the chemical amplifier technique in combination with other analytical techniques to investigate chemical mechanisms of atmospheric interest in photoreactors. |
| Databáze: | OpenAIRE |
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