Masaaki Oya

Reaction rates of O(3P) atom with fluoroethanes at 1000-1400 K

Abstract The overall rate constants for reactions of O ( 3 P ) with three fluoroethanes, O ( 3 P )+ CH 3 CH 2 F → OH + CH 2 CH 2 F / CH 3 CHF (1), O ( 3 P )+ CH 2 FCH 2 F → OH + CHFCH 2 F (2), and O ( 3 P )+ CH 3 CHF 2 → OH + CH 2 CHF 2 / CH 3 CF 2 (3), were measured by laser flash photolysis in shock heated sample gases at 1000–1400 K. The rate constants were obtained in the simple Arrhenius form, k=Aexp(−Ea/RT), where A=2.19×10−9, 1.24×10−9 and 7.43×10 −9 cm 3 molecule −1 s −1 and Ea=58.0, 57.0 and 82.7 kJ mol−1, and uncertainty factors for k at 2σ level are F=1.36, 1.27 and 1.19, respectively. The effect of substitution of the fluorine atom on the overall rate constant is discussed in comparison with the corresponding rates for a series of alkanes and fluoromethanes.

High-Temperature Reaction of O(3P)+H2S

The reaction of atomic oxygen (3P) with hydrogen sulfide was investigated by the shock tube - laser photolysis method at high temperatures (1100–2000 K), where time dependences of O and H atoms were monitored with atomic resonance absorption spectrometry (ARAS). O atoms were produced by the photolysis of SO2 by an KrF excimer laser behind reflected shock waves. The overall rate constant for the reaction

Kinetic Studies on the Pyrolysis of H2S

O + {H_2}S \to products

Method and apparatus for monitoring and controlling burner operating air equivalence ratio

(1) was determined from the decay rate of the absorption of O atoms as k 1 = (2.8 ± 0.3) x 10-10exp[-(32 ± 2)kJmol-1/RT] cm3molecule-1 s-1. The branching fraction for the substitution channel

Computational Studies on the Reactions of N2O with O(3P) and CO

O + {H_2}S \to H + HSO

PCDD/Fs Formation Behavior in Model Waste Incineration

(1c) was determined from the time dependence of the H atoms, that is, k 1c/k 1 = 0.24 ± 0.06 at 1520- 1820 K. The rate constant k 1 and the branching fraction k 1c/k1 are also theoretically discussed based on the conventional transition state theory with the Wigner’s tunneling correction for the potential energies.