A shock tube study of the reactions of CN and NCO with NO{sub 2}

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:93248

Wooldridge, S T; Mertens, J D; Hanson, R K; Bowman, C T ^[1]

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1. Stanford Univ., CA (United States)

The total rate coefficient for the reactions: CN + NO = products (1) and NCO + NO{sub 2} = products (2) were measured at temperatures between 1,000 and 1,600 K and pressures near 1.4 atm in a shock tube. Narrow-line laser absorption was utilized to record time histories of CN and NCO radicals in C{sub 2}N{sub 2}/NO{sub 2}/Ar laser photolysis experiments. In the experiment, CN production is nearly instantaneous via photolysis of C{sub 2}N{sub 2}; production of NCO radicals follows from the main product channel of reaction (1). A least-squares fit to the results for reaction (1) is given by the expression k{sub 1} = 1.59 {times} 10{sup 13} exp(570/T [K]) cm{sup 3}/mol s with corresponding uncertainty factors of f = 0.91 and F = 1.09 at the low-temperature extreme; f = 0.84 and F = 1.17 result at the high-temperature extreme. The uncertainty factors give the limiting values of the rate coefficient: k{sub min} = fk{sub best fit}, k{sub max} = Fk{sub best fit}. The rate coefficient of reaction (2) was measured as k{sub 2} = 4.5 {times} 10{sup 12} cm{sup 3}/mol s (f = 0.75, F = 1.27) for temperature near 1,250 K. Incorporating the data from the present study with the results from lower-temperature studies gives the following empirical expressions for the total rate coefficients valid for temperatures ranging from 300 to 1,600 K: k{sub 1} = 6.16 {times} 10{sup 15} T [K]{sup {minus}0.752} exp({minus}173/T [K]) cm{sup 3}/mol s; k{sub 2} = 3.25 {times} 10{sup 12} exp(356/T [K]) cm{sup 3}/mol s.

• OSTI ID: 93248
• Report Number(s): CONF-940711--
• Country of Publication: United States
• Language: English

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