Temperature-Dependent Kinetic Study of the Reaction of Hydroxyl Radicals with Hydroxyacetone

The kinetics of the reaction of OH radicals with hydroxyacetone has been investigated as a function of temperature at a total pressure of helium of 2.0-2.1 Torr and over an extended temperature range of T = 250-830 K and as a function of pressure a T = 301 K in the pressure range 1.0-10.4 Torr. The rate constant of the reaction OH + CH 3 C(O)CH 2 OH → products (1) was measured using both absolute (from the kinetics of OH consumption in excess of hydroxyacetone) and relative rate methods ( k 1 = 4.7 × 10 -22 × T 3.25  exp (1410/ T ) cm 3 molecule -1 s -1 a T = 250-830 K). The present data combined with selected previous temperature-dependent studies of reaction (1) yield k 1 = 4.4 × 10 -20 × T 2.63  exp (1110/ T ) cm 3 molecule -1 s -1 , which is recommended from the present work a T = 230-830 K (with conservative uncertainty of 20% at all temperatures). k 1 was found to be independent of the pressure in the range from 1.0 to 10.4 Torr of He a T = 301 K. The present results are compared with previous experimental and theoretical data.