A shock tube study of reactions of CN with HCN, OH, and H2 using CN and OH laser absorption

✍ Scribed by Steven T. Wooldridge; Ronald K. Hanson; Craig T. Bowman

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 979 KB
• Volume: 28
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1996)28:4<245::aid-kin2>3.0.co;2-v

✦ Synopsis

Quantitative, narrow-line laser absorption measurements of CN time-histories at 388 444 n m were acquired in high-temperature pyrolysis and laser photolysis shock tube experiments The data were analyzed using a detailed kinetics mechanism to determine the rate coefficients of the reactions C N + OH -Products CN + HCN -CzN2 + H HCN + H C N + Hztor temperatures between 940 and 1860 K Two independent experimental approaches were utilized laser photolysis (at 193 nml of dilute C,N1/HCN/argon and CINz/H,/argon mixtures in reflected shock wave experiments and shock heating of HNO,/HCN/argon mixtures in incident and reflected shock wave experiments Laser absorption measurements of OH at 306687 nm were also taken in the HN03/HCN/argon experiments The results are in good agreement with rate coefficient determinations from previous studies at different 'emperatures The expression kz = 1.51 X 10' T1"exp(-770/T) cm3 mol-' s -I (f = 0.85,F = 1.15). derived by Yang et al (1992) from their kz measurements in combination with those of Szekely et al. 11983). is recommended for the broad temperature range 300-3000 K T h e uncertainty factors f and F give the limiting values of the rate coefficient: k,,, = f k k S l f r t , k,,,, = Fkb,,, r,, T h e recommended expression for the rate coefficient of reaction 13) k3 = 2.95 X lo5 T'"sexp(-1126/T) cm3 mol-' s-" , (f = 0.83, F = 1.221,