ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The formation yields of selected products of the OH radical-initiated reactions of toluene, o-xylene, and 1,2,3,-trimethylbenzene have been measured in the absence of NOx and in the presence of varying concentrations of NO and NO2. The formation yield of o-cresol from toluene increased from 0.123 ± 0.022 in the absence of NOx to 0.160 ± 0.008 for an average NO2 concentration of 1.7 × 1014 molecule cm3. The formation yield of 2,3-butanedione from o-xylene was 0.092 ± 0.013 in the absence of NOx, and in the presence of NOx decreased from 0.16 at an average NO2 concentration of (7-8) × 1012 molecule cm-3 to 0.09 at an average NO2 concentration of ca. 7 × 1013 molecule cm-3. The formation yield of 2,3-butanedione from 1,2,3-trimethylbenzene increased from 0.18 in the absence of NOx to 0.444 ± 0.053 in the presence of ca. (0.16-3.6) × 1013 molecule cm-3 of NO2. These product data are consistent with literature kinetic data showing that the hydroxycyclohexadienyl radicals formed by OH radical addition to the aromatic ring react with both O2 and NO2 and with the NO2 reaction rate constants being ca. 105 higher than the O2 reaction rate constants at room temperature. Under typical tropospheric conditions the reactions of the hydroxycyclohexadienyl radicals with O2 will dominate over their reactions with NO2. © 1994 John Wiley & Sons, Inc.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550260907
