Rate constants for the reaction of HO/sub 2/ with HO/sub 2/, SO/sub 2/, CO, N/sub 2/O, trans-2-butene, and 2,3-dimethyl-2-butene at 300 K

Journal Article · Mon Jan 01 04:00:00 EST 1979 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100475a002· OSTI ID:5359645

Graham, R A; Winer, A M; Atkinson, R; Pitts, Jr, J N

Relative rate constants have been measured at 300 K and 1 atm total pressure for reactions of HO/sub 2/ with HO/sub 2/, SO/sub 2/, CO, N/sub 2/O, trans-2-butene, and 2,3-dimethyl-2-butene. The thermal decomposition of HO/sub 2/NO/sub 2/ was used as a source of HO/sub 2/ radicals, and rate constants were measured relative to that of HO/sub 2/ + NO/sub 2/ reaction. A rate constant of 3.8 x 10-12 cm3/molecule/s (total uncertainty is a factor of 2) was measured for the HO/sub 2/ disproportionation reaction; the good agreement of this value with the average literature value of approx 3 x 10-12 cm3/molecule/s supports the validity of the present experimental techniques. Rate constate upper limits of 1 x 10/sup -18/, 2 x 10/sup -20/, and 4 x 10/sup -18/ cm3/molecule/S were obtained for the reactions of HO/sub 2/ with SO/sub 2/, N/sub 2/O, and trans-2-butene, respectively; these values indicate that the reactions will be of negligible atmospheric importance. Significant reaction rates were observed with CO and 2,3-dimethyl-2-butene and may correspond to HO/sub 2/ rate constants as large as 2 x 10-19 and 4 x 10-17 cm3/molecule/S, respectively; these values must be regarded as only upper limits because of the possible effects of large amounts of the reactants on HO/sub 2/NO/sub 2/ in the gas phase or on the cell surfaces.

• OSTI ID: 5359645
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
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