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The rate constant of NO + O3 → NO2 + O2 in the temperature range of 283–443 K

✍ Scribed by H. H. Lippmann; Barbara Jesser; Ulrich Schurath

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
398 KB
Volume
12
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The reaction NO + O~3~ → NO~2~ + O~2~ has been studied in a 220‐m^3^ spherical stainless steel reactor under stopped‐flow conditions below 0.1 mtorr total pressure. Under the conditions used, the mixing time of the reactants was negligible compared with the chemical reaction time. The pseudo‐first‐order decay of the chemiluminescence owing to the reaction of ozone with a large excess of nitric oxide was measured with an infrared sensitive photomultiplier. One hundred twenty‐nine decays at 18 different temperatures in the range of 283–443 K were evaluated. A weighted least‐squares fit to the Arrhenius equation yielded k = (4.3 ± 0.6) × 10^−12^ exp[‐(1598 ± 50)/T] cm^3^/molecule sec (two standard deviations in brackets). The Arrhenius plot showed no curvature within experimental accuracy. Comparison with recent results of Birks and co‐workers, however, suggests that a nonlinear fit, as proposed by these authors, is more appropriate over an extended temperature range.

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