Direct studies of the thermal decomposition of N{sub 2}O and CO{sub 2} and of the reaction of CO with O{sub 2} [electronic resource].

Imprint: Washington, D.C. : United States. Dept. of Energy. ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1992
Physical description: 1 online resource (32 p. ) : digital, PDF file.

Online

Contributor: Brookhaven National Laboratory Researcher; United States. Dept. of Energy. Sponsor; United States. Dept. of Energy. Office of Scientific and Technical Information. Distributor; Sutherland, J.W. Author; Patterson, P.M. Author; Klemm, R.B. Author

Summary: The thermal decompositions of N₂O and CO₂ was investigated by monitoring the kinetics of formation of O(³P) atoms in the reflected shock regime using atomic resonance absorption spectrophotometry (A.R.A.S.). The temperature range was 1805K to 2379K for N₂O and 2332K to 2869K for CO₂. Total densities were 3--4 × 10¹⁸ molecules cm{sup −3} and hence the reported rate constants are at or near the low pressure limit for unimolecular decomposition. The results were expressed by the following Arrhenius equations: CO₂ k(T) = (1.63 ± 1.96) × 10{sup −8} exp(−122565 ± 5183/RT) cm³ molecule{sup −1} s{sup −1} N₂O k(T) = (6.02 ± 2.81) × 10¹° exp(−53397 ± 1865/RT) cm³ molecule{sup −1} s{sup −1}. Uncertainties in the Arrhenius expressions are given at the one standard deviation level and the mean deviations of the experimental data from the respective expression are ± 18.6% and ± 30.7%. Corresponding values for the reverse reaction, k{sub rev}(CO₂) were computed from the expression k{sub for}/k{sub rev} = K{sub c}. The value obtained for k{sub rev}(CO₂) was (2.18 ± 0.83) × 10{sup −34} cm⁶ molecule{sup −2} s{sup −1}, independent of temperature from 2332K to 2869K. Preliminary results are also reported for the direct determination of the rate constant for the reaction, CO + O₂ → CO₂ + O, from measurements of the initial rate of formation of O(³P) atoms. 35 refs., 9 figs., 4 tabs.

Subjects: Atoms.; Excited States.; Oxygen.; Chemical Reactions.; Nitrous Oxide.; Decomposition.; Carbon Dioxide.; Carbon Monoxide.; Arrhenius Equation.; Radiation Absorption Analysis.; Shock Tubes.; Photolysis.; Temperature Range 1000-4000 K.; Inorganic, Organic, Physical And Analytical Chemistry.

Publication date: 1992
Note: Published through SciTech Connect.; 02/01/1992.; "bnl--46985"; " conf-920707--17"; "DE92007183"; 24. international symposium on combustion, Sydney (Australia), 5-10 Jul 1992.; Sutherland, J.W.; Patterson, P.M.; Klemm, R.B.
Funding information: AC02-76CH00016