A Shock Tube Study of OH + H2O2 -> H2O + HO2 and H2O2 + M -> 2OH+M using Laser Absorption of H2O and OH

作者：Hong Zekai^*; Cook Robert D; Davidson David F; Hanson Ronald K

来源：Journal of Physical Chemistry A, 2010, 114(18): 5718-5727.

DOI：10.1021/jp100204z

The rate constants of the reactions
H2O2 + M -> 2OH + M (1)
OH + H2O2 -> H2O + HO2 (2)
were measured in shock-heated H2O2/Ar mixtures using laser absorption diagnostics for H2O and OH. Time-histories of H2O were monitored using tunable diode laser absorption at 2550.96 nm, and time-histories of OH were achieved using ring dye laser absorption at 306 nm. Initial H2O2 concentrations were also determined utilizing the H2O diagnostic. On the basis of simultaneous time-history measurements of OH and H2O, k(2) was found to be 4.6 x 10(13) exp(-2630 K/T) [cm(3) mol(-1) s(-1)] over the temperature range 1020-1460 K at 1.8 atm: additional measurements of k(2) near 1 atm showed no significant pressure dependence. Similarly, k(1) was found to be 9.5 x 10(15) exp(-21 250 K/T) [cm(3) mol(-1) s(-1)] over the same temperature and pressure range.

• 出版日期2010-5-13