Rate coefficient for H + O2 + M = HO2 + M evaluated from shock tube measurements of induction times

✍ Scribed by M.W. Slack

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 682 KB
• Volume: 28
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(77)90031-1

✦ Synopsis

Hydrogen-air induction times near to the second explosion limit have been measured in a shock tube. By matching these experimental results with numerically predicted induction times, the rate coefficient for the reaction H + 0 2 + M = HO 2 + M, was evaluated as k4,N2 = 3.3(+_.6) × 1015cm6mole--2sec -1 in the temperature range 980 to 1176 o K. A similar analysis of hydrogen-oxygen-argon induction time data, obtained by Skinner and Ringrose, yielded k4,Ar = 2.2 (+-.4) X 1015cm6mole--2sec--1 over the temperature range 964 to 1075 °K. The sensitivity of induction times to the rate coefficients of other reactions in the H2-O 2 system was examined. The present values of k 4 agreed well with previous high-temperature shock ~ube data and, based on a critical evaluation, k4,Ar = 2.1 X 1018 • T-lcm6mole--2sec -1, is recommended as giving the best fit to experimental data between 200 and 2200 °K. Data on the efficiency of nitrogen relative to argon as the chaperon molecule exhibits a systematic temperature dependence, decreasing from about 3.1 at 300 °K to 1.5 above 1000 °K.