A shock tube study of the CO + OH {yields} CO{sub 2} + H reaction
Book
·
OSTI ID:93222
- Stanford Univ., CA (United States)
The rate coefficient for the title reaction has been determined using mixtures of nitric acid (HNO{sub 3}), carbon monoxide (CO), and argon in incident shock wave experiments. Upon shock heating, the nitric acid rapidly decomposes into OH and NO{sub 2}. The OH subsequently reacts predominantly via the title reaction. Quantitative OH time histories were obtained by continuous-wave (cw) narrow-linewidth UV laser absorption of the R{sub 1}(5) line of the A{sup 2}{Sigma}{sup +} {l_arrow} X{sup 2}{Pi}{sub i} (0,0) transition at 32,606.56 cm{sup {minus}1} (vacuum). In some experiments, helium was added to the reactant mixture to examine CO vibrational excitation effects on the rate coefficient determination. It was found that the rate of excited CO (v = 1) with OH is less than the rate of ground-state CO (v = 0) with OH, which is in agreement with previous state-dependent work. The experiments were conducted over the temperature range 1,090--2,370 K and the pressure range 0.19--0.82 atm. The second-order rate coefficient was determined to be k{sub 1}(T) = 2.12 {times} 10{sup 12} exp[{minus}2630/T (K)] (cm{sup 3}/mol s) with overall uncertainties of + 16, {minus}12 % at high temperatures and + 19, {minus} 22 % at low temperatures. These results are in good agreement with recent studies of the reaction and are well fit by a chemically activated intermediate model. The current work also provides a link to previous low-temperature data.
- OSTI ID:
- 93222
- Report Number(s):
- CONF-940711--
- Country of Publication:
- United States
- Language:
- English
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