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A shock tube study of CO + OH → CO2 + H and HNCO + OH → products via simultaneous laser absorption measurements of OH and CO2

✍ Scribed by Margaret S. Wooldridge; Ronald K. Hanson; Craig T. Bowman

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
803 KB
Volume
28
Category
Article
ISSN
0538-8066

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✦ Synopsis

The rate coefficients for the reactions

were determined using mixtures of HN03/CO/Ar and HN03/HNCO/Ar in incident shock wave experiments Simultaneous OH and COz absorption time-histories were obtained via cw uv narrow-linewidth absorption at 32606 56 cm-' ( A = 306 687 nm) and cw infrared narrowlinewidth absorption at 2380 72 cm-' ( A = 4 2004 ,urn), respectively The measurements of k l determined from measured CO] time-histories are in good agreement with those determined from previous measurements of OH time-histories at this laboratory The rate coefficient for the overall reaction of HNCO + OH -Products was determined from analysis of OH data traces T h e uncertainty in k 2 was found to be +22%, -16% By incorporating data from a previous low-temperature study, the following empirical expression was determined for the birnolecular reaction-kZ = 3.63 X lo7 T ' exp( -1809/T) [cm' mol-'s-'] over the temperature range 620-1860 K From analysis of C 0 2 data traces, an upper limit on the branching fraction ( a = kzJk2) for reaction (2a) of 10% was found, independent of temperature over the range 1250-1860 K 0

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