||Investigation of Hydroxyl Radical Reactions with o-Xylene and m-Xylene in a Continuous Stirred Tank Reactor (Journal Version).
Grey, M. W. ;
Fox, D. L. ;
Kamens, R. M. ;
Stockburger, L. ;
||North Carolina Univ. at Chapel Hill. Dept. of Environmental Sciences and Engineering. ;Systems Applications, Inc., San Rafael, CA.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Air pollution ;
Hydroxyl radicals ;
Photochemical reactions ;
Aromatic monocyclic hydrocarbons ;
Reaction kinetics ;
Nitro compounds ;
Ultraviolet radiation ;
Nitrous acid ;
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||The gas phase reactions of hydroxyl radicals with o-Xylene and m-Xylene were studied in a continuous stirred tank reactor. Gas and aerosol products accounted for 65 to 85 percent of the reacted carbon. Approximately 19 and 10 percent of the original o-Xylene and m-Xylene oxidation occurred through methyl hydrogen abstraction by OH, primarily leading to methylbenzyl nitrates and tolualdehydes. The remaining mass reacted through the OH addition pathway forming dimethylphenols, nitro-dimethylphenols, nitroxylenes and stable products resulting from further reaction of metastable 02-OH-adducts (including alpha-dicarbonyls, methyl-p-benzoquinones, CO and formaldehyde). For o-Xylene the ratio of reaction rate constants for formation of nitroxylenes versus dimethylphenols was estimated to be 59,000, while the same value for m-xylene was only about 10,000. The ratios of the dimethylphenol formation rates to the effective oxygen addition rates were found to be greater than or equal to 0.15 for o-Xylene and 0.27 for m-Xylene. These vary significantly from the approximations used in current photochemical kinetics models.
||Pub. in Environmental Science and Technology, v21 n4 p339-348 Apr 87. Prepared in cooperation with Systems Applications, Inc., San Rafael, CA. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
|NTIS Title Notes
||Reprint: Investigation of Hydroxyl Radical Reactions with o-Xylene and m-Xylene in a Continuous Stirred Tank Reactor (Journal Version),
||Not available NTIS