화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.122, No.4, 916-922, 2018
Kinetics and Products of the Reaction of OH Radicals with CINO from 220 to 940 K
The kinetics and products of the reaction of OH radicals with CINO have been studied in a flow reactor coupled with an electron impact ionization mass spectrometer at nearly 2 Torr total pressure of helium and over a wide temperature range, T = 220-940 K. The rate constant of the reaction OH + CINO -> products was determined under pseudo-first order conditions, monitoring the kinetics of OH consumption in excess of CINO: k(1) = 1.48 X 10(-18) X Ti-2.12 exp(146/T) cm(3) molecule(-1)S(-1) (uncertainty of 15%). HOCI, Cl, and HONO were observed as the reaction products. As a result of quantitative detection of HOCI and Cl, the partial rate constants of the HOCI + NO and CI + HONO forming reaction pathways were determined in the temperature range 220-940 K: k(1a) = 3.64 X 10(-18) X T-1.99 exp(-114/T) and k(1b) = 4.71 x 10(-18) X T-1.74 exp(246/T) cm(3) molecule(-1),s(-1) (uncertainty of 20%). The dynamics of the title reaction and, in particular, non-Arrhenius behavior observed for both k(1a), and k(1b) in a wide temperature range, seems to be an interesting topic for theoretical research.