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First Experimental Determination of the Absolute Gas-Phase Rate Coefficient for the Reaction of OH with 4-Hydroxy-2-Butanone (4H2B) at 294 K by Vapour Pressure Measurements of 4H2B.
MedLine Citation:
PMID:  23210721     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The reaction of the OH radicals with 4-hydroxy 2-butanone was investigated in the gas-phase using an absolute rate method at room temperature and over the pressure of 10 to 330 Torr in He and air as diluent gases. The rate coefficients were measured using pulsed laser photolysis (PLP) of H2O2 to produce OH and laser induced fluorescence (LIF) to measure the OH temporal profile. An average value of (4.8 ± 1.2)×10-12 cm3 molecule-1 s-1 was obtained. The OH quantum yield following the 266 nm pulsed laser photolysis of 4-hydroxy 2-butanone was measured for the first time and found to be about 0.3 %. The investigated kinetic study required accurate measurements of the vapour pressures of 4-hydroxy 2-butanone which was measured using a static apparatus. The vapour pressure was found to range from 0.056 to 7.11 Torr between 254 K and 323 K. This work provides the first absolute rate coefficients for the reaction of 4-hydroxy 2-butanone with OH and the first experimental saturated vapour pressures of the studied compound below 311 K. The obtained results are compared to those of the literature and the effects of the experimental conditions on the reactivity are examined. The calculated tropospheric lifetime obtained in this work suggests that once emitted into the atmosphere, 4H2B may contribute to the photochemical pollution in a local or regional scale.
Authors:
Gisele El Dib; Chantal Sleiman; Andre Canosa; Daniel Travers; Jonathan Courbe; Terufat Sawaya; Ilham Mokbel; Abdelkhaleq Chakir
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-4
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  -     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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