Azyazov, V.N.

Pershin, A.A.

Torbin, A.P.

Samara University

97  Ozone recovery in the presence of nitrous oxides A.A. Pershin, A.P. Torbin, V.N. Azyazov Samara University. 443086, Samara, Moskovskoye shosse, 34. E-mail: anchizh93@gmail.com, torbinalex@gmail.com, azyazov@rambler.ru The temporal profiles of ozone number densities after pulsed UV laser photolysis in a gas mixture O2-O3-N2-N2O obtained by time-resolved absorption spectroscopy was presented. The experimental results demonstrated the dominance of the stabilization channel over the reactive one for the reaction of O3 (υ) with N2O and NO. The rate constants for the processes O3(υ) + N2O → О3 + N2O and O3(υ) + NO → О2 + NO2 was obtained to be (1.5±0.2) × 10-13 cm3/s and (2.0±0.2) × 10-11 cm3/s, respectively, using kinetics modeling of experimental data. Vibrationally excited ozone can react with compounds of fuel-air mixtures in fire zones of power-producing units, also with nitrious oxides in high temperature zones. Reaction of vibrationally excited ozone with nitrogen oxide O3(υ) + NО  NО2 + О2  (1) has more probability then reaction with thermalized ozone O3 + NО  NО2 + О2 with rate constant 1.8×10-14 см3/с [1-4]. Also, kinetic data for relaxation process O3(υ) + N2О  О3 + N2О (2) are missed in literature. In this work rate constants for processes (1-2) was found by temporal profiles of ozone number densities in different conditions of gas mixture O2-O3-N2-N2O after UV laser photolysis [5]. The rate constants for the processes (1) and (2) was obtained to be (2.0±0.2) × 10-11 cm3/s and (1.5±0.2) × 10-13 cm3/s, respectively.  Figure 1 – Temporal profiles for concentration of O3 for E=70 mJ/cm2, Ptot=807 Torr,  PO2 =600 Torr, T=300 K and different pressures of N2O.  References 1. Atkinson R., Baulch D. L., Cox R. A., Crowley J. N., Hampson R. F., Hynes R. G., Jenkin M. E., Rossi M. J., Troe J., http://www.iupac-kinetic.ch.cam.ac.uk/. 2. Rosenberg C.W. and Trainor D.W., "Vibrational excitation of ozone formed in recombination." J. Chem. Phys., vol. 61, p. 2442 (1974). 3. Rawlins W.T., Caledonia G.E., Armstrong R.A., "Dynamics of vibrationally excited ozone formed by three-body recombination: II. Kinetics and mechanism." J. Chem. Phys., vol. 87, p. 5209 (1987). 4. Steinfield J.I., Adler-Golden S.M., Gallagher J.W., Critical survey of data on the spectroscopy and kinetics of ozone in mesosphere and thermosphere. J. Phys. Chem. Ref. Data vol. 16, p. 911 (1987). 5. Azyazov V.N., Heaven M.C. Kinetics of Active Oxygen Species with Implications for Atmospheric Ozone Chemistry. // Intern. Jour. Chem. Kin. 2015, Vol. 47, #2, p. 93–103.  

Ozone recovery in the presence of nitrous oxides

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Ozone recovery in the presence of nitrous oxides

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