A flash photolysis-shock tube kinetic study of the H atom reaction with O sub 2 : H + O sub 2 rightleftharpoons OH + O (962 K le T le 1705 K) and H + O sub 2 + Ar yields HO sub 2 + Ar (746 K le T le 987 K)

Journal Article · Thu Jan 12 00:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100338a058· OSTI ID:5447020

Pirraglia, A N; Michael, J V; Sutherland, J W; Klemm, R B ^[1]

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1. Brookhaven National Lab., Upton, NY (USA)

Rate constants for the reactions H + O{sub 2} {yields} OH + O (1) and H + O{sub 2} + M {yields} HO{sub 2} + M (2) were measured under pseudo-first-order conditions by the flash photolysis-shock tube technique that employs the atomic resonance absorption detection method to monitor (H){sub t}. Rate data for reaction 1 were obtained over the temperature range from 962 to 1705 K, and the results are well represented by the Arrhenius expression k{sub 1}(T) = (2.79 {plus minus} 0.32) {times} 10{sup {minus}10} exp(-16132 {plus minus} 276 cal mol{sup {minus}1}/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. The mean deviation of the experimentally measured rate constants from those calculated by using this expression is {plus minus}16% over the stated temperature range. The recent shock tube data of Frank and Just (1693-2577 K) were combined with the present results for k{sub 1}(T) to obtain the following Arrhenius expression for the overall temperature span (962-2577 K); k{sub 1}(T) = (3.18 {plus minus} 0.24) {times} 10{sup {minus}10} exp(-16439 {plus minus} 186 cal mol{sup {minus}1}/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. The mean deviation of the experimentally measured rate constants from this expression is {plus minus}15% over the entire temperature range. Values for the rate constant for the reverse of reaction 1 were calculated from each of the experimentally measured K{sub 1}(T) values with expressions for the equilibrium constant derived by using the latest JANAF thermochemical data. These k{sub {minus}1}(T) values were also combined with similarly derived values from the Frank and Just data.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5447020
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 93:1; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ARGON
CHEMICAL REACTION KINETICS
PHOTOLYSIS
HYDROGEN
OXYGEN COMPOUNDS
EXPERIMENTAL DATA
SHOCK TUBES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
FLUIDS
GASES
INFORMATION
KINETICS
NONMETALS
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
RARE GASES
REACTION KINETICS
400500* - Photochemistry