A Shock Tube Study of OH + H2O2 → H2O + HO2 and H2O2 + M → 2OH+M using Laser Absorption of H2O and OH

被引：89
|
作者：
Hong, Zekai [1 ]
Cook, Robert D. [1 ]
Davidson, David F. [1 ]
Hanson, Ronald K. [1 ]
机构：
[1] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY A | 2010年 / 114卷 / 18期
基金：
美国国家科学基金会;
关键词：
HYDROGEN COMBUSTION; LASER PHOTOLYSIS; RATE CONSTANTS; KINETICS; H2O2; OPTIMIZATION; ENTHALPY; FLASH; DISSOCIATION; CHEMISTRY;
D O I：
10.1021/jp100204z
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The rate constants of the reactions H2O2 + M -> 2OH + M (1) OH + H2O2 -> H2O + HO2 (2) were measured in shock-heated H2O2/Ar mixtures using laser absorption diagnostics for H2O and OH. Time-histories of H2O were monitored using tunable diode laser absorption at 2550.96 nm, and time-histories of OH were achieved using ring dye laser absorption at 306 nm. Initial H2O2 concentrations were also determined utilizing the H2O diagnostic. On the basis of simultaneous time-history measurements of OH and H2O, k(2) was found to be 4.6 x 10(13) exp(-2630 K/T) [cm(3) mol(-1) s(-1)] over the temperature range 1020-1460 K at 1.8 atm: additional measurements of k(2) near 1 atm showed no significant pressure dependence. Similarly, k(1) was found to be 9.5 x 10(15) exp(-21 250 K/T) [cm(3) mol(-1) s(-1)] over the same temperature and pressure range.
引用
收藏
页码：5718 / 5727
页数：10
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