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

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The thermal decompositions of N{sub 2}O and CO{sub 2} was investigated by monitoring the kinetics of formation of O({sup 3}P) atoms in the reflected shock regime using atomic resonance absorption spectrophotometry (A.R.A.S.). The temperature range was 1805K to 2379K for N{sub 2}O and 2332K to 2869K for CO{sub 2}. Total densities were 3--4 {times} 10{sup 18} molecules cm{sup {minus}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: CO{sub 2} k(T) = (1.63 {plus minus} 1.96) {times} 10{sup {minus}8} exp({minus}122565 {plus minus} 5183/RT) ... continued below

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Pages: (32 p)

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Sutherland, J.W.; Patterson, P.M. & Klemm, R.B. January 1, 1992.

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The thermal decompositions of N{sub 2}O and CO{sub 2} was investigated by monitoring the kinetics of formation of O({sup 3}P) atoms in the reflected shock regime using atomic resonance absorption spectrophotometry (A.R.A.S.). The temperature range was 1805K to 2379K for N{sub 2}O and 2332K to 2869K for CO{sub 2}. Total densities were 3--4 {times} 10{sup 18} molecules cm{sup {minus}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: CO{sub 2} k(T) = (1.63 {plus minus} 1.96) {times} 10{sup {minus}8} exp({minus}122565 {plus minus} 5183/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} N{sub 2}O k(T) = (6.02 {plus minus} 2.81) {times} 10{sup 10} exp({minus}53397 {plus minus} 1865/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}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 {plus minus} 18.6% and {plus minus} 30.7%. Corresponding values for the reverse reaction, k{sub rev}(CO{sub 2}) were computed from the expression k{sub for}/k{sub rev} = K{sub c}. The value obtained for k{sub rev}(CO{sub 2}) was (2.18 {plus minus} 0.83) {times} 10{sup {minus}34} cm{sup 6} molecule{sup {minus}2} s{sup {minus}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 + O{sub 2} {yields} CO{sub 2} + O, from measurements of the initial rate of formation of O({sup 3}P) atoms. 35 refs., 9 figs., 4 tabs.

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Pages: (32 p)

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OSTI; NTIS; GPO Dep.

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  • 24. international symposium on combustion, Sydney (Australia), 5-10 Jul 1992

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  • Other: DE92007183
  • Report No.: BNL-46985
  • Report No.: CONF-920707--17
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5421188
  • Archival Resource Key: ark:/67531/metadc1072250

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  • January 1, 1992

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 20, 2018, 7:04 p.m.

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Sutherland, J.W.; Patterson, P.M. & Klemm, R.B. 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, article, January 1, 1992; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1072250/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.