Kinetics of reactions involving CN emission IV. Study of the reactions of CN by electronic absorption spectroscopy

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Abstract
The kinetics of the reaction between oxygen atoms and cyanogen have been studied in a capacity flow reactor at temperatures between 570 and 687 °K. The concentration of CN radicals was measured by electronic absorption spectroscopy. This work confirms the previously proposed mechanism (part II). The initial step has a rate constant of k1 = 2∙5 (± 0∙3) x 1013exp ( – 11000±2000/RT) cm3 mole–1 s–1. CN radicals are removed mainly by reactions (4) and (2) for which k4 = 6∙3 (±3∙5) x 1013exp (–2400±700/RT) cm3 mole–1s–1 and k2 = 4∙4 (±2∙0) x 1012 cm3 mole–1s–1. CN+O = CO+N, (4) CN+O2 = NCO+O. (2) The rates of reaction of CN with NO and NH3 were also measured; for CH4 and H2 limiting values were obtained.