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Rate coefficients for the reactions of OH radicals with Methylglyoxal and Acetaldehyde
Author(s) -
Tyndall Geoffrey S.,
Staffelbach Thomas A.,
Orlando John J.,
Calvert Jack G.
Publication year - 1995
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550271006
Subject(s) - chemistry , radical , methylglyoxal , acetaldehyde , analytical chemistry (journal) , photochemistry , hydrogen atom abstraction , fourier transform infrared spectroscopy , organic chemistry , ethanol , enzyme , physics , quantum mechanics
Rate coefficients have been measured for the reaction of OH radicals with methylglyoxal from 260 to 333 K using the discharge flow technique and laser‐induced fluorescence detection of OH. The rate coefficient was found to be (1.32±0.30) × 10 −11 cm 3 molecule −1 s −1 at room temperature, with a distinct negative temperature dependence (E/R of −830 ± 300 K). These are the first measurements of the temperature dependence of this reaction. The reaction of OH with acetaldehyde was also investigated, and a rate coefficient of (1.45 ± 0.25) × 10 −11 cm 3 molecule −1 s −1 was found at room temperature, in accord with recent studies. Experiments in which O 2 was added to the flow showed regeneration of OH following the reaction of CH 3 CO radicals with O 2 . However, chamber experiments at atmospheric pressure using FTIR detection showed no evidence for OH production. FTIR experiments have also been used to investigate the chemistry of the CH 3 COCO radical formed by hydrogen abstraction from methylglyoxal. © 1995 John Wiley & Sons, Inc.