Temperature Dependence of the Reaction NO3 + NO2 --> NO + NO2 + O2 in the Range from 296 to 332 K

Article abstract of DOI:10.1021/j100198a029

The temperature dependence of the / ratio in N2O5/NO2/N2 gas mixtures has been determined in the range 296 K <*> T <*> 332 K.The experiments were made at 50 mbar in a static reactor.Tunable diode laser spectroscopy was used to measure while and wre determined by FTIR spectroscopy.The use of a steady-state assumption for NO in the gas mixtures leads to the expression k1/k2 = / where k1 and k2 are the rate coefficients for the title reaction and the reaction NO + NO3 -> 2NO2, respectively.The relation k1/k2 = 3.3 x 10^-3 exp(-1598/T) was found to describe the experimental data.The present result, in conjunction with a recently reported value for k2 , yields k1 = 5.4 x 10^-14 exp(-1488/T) cm³ molecule^-1 s^-1.The estimated accuracy at the 95percent confidence level is +/- 29 percent .The error in activation energy of k1 due to the functional dependence on k2 is expected to be small due to the low activation energy of the latter.