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Temperature-Dependent Kinetic Study of the Reaction of Hydroxyl Radical with Hydroxyacetone.

The kinetics of the reaction of OH radicals with hydroxyacetone has been investigated as a function of temperature at (2.0 - 2.1) Torr total pressure of helium and over an extended temperature range, T = 250 - 830 K, and as a function of pressure at T = 301 K in the pressure range 1.0-10.4 Torr. The rate constant of the reaction OH + CH3C(O)CH2OH  products (1) was measured using both absolute (from the kinetics of OH consumption in excess of hydroxyacetone) and relative rate method, k1 = 4.7×10-22×T3.25exp(1410/T) cm3molecule-1s-1 at T = 250-830 K. The present data combined with selected previous temperature dependent studies of reaction (1) yield k1 = 4.4×10-20×T2.63exp(1110/T) cm3molecule-1s-1, which is recommended from the present work at T = 230-830K (with conservative uncertainty of 20% at all temperatures). k1 was found to be pressure independent in the pressure range from 1.0 to 10.4 Torr of He at T = 301 K. The present results are compared with previous experimental and theoretical data.