Rate constants for the reaction, O( sup 3 P) + H sub 2 O r equilibrium OH + OH, over the temperature range 1053K to 2033K using two direct techniques

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6382038

Sutherland, J W; Patterson, P M; Klemm, R B

The rate constant for the reaction of O({sup 3}P) with H{sub 2}O (reaction (1)) was measured over the temperature range 1288K {le} T {le} 2033K using the flash photolysis-shock tube technique and at 1053, 1090 and 1123K using the flash photolysis-resonance fluorescence method. The photolytic source for O({sup 3}P) atoms was nitric oxide. The results were given by the Arrhenius expression: k{sub 1}(T) = (9.2 {plus minus} 0.9) {times} 10{sup {minus}11} exp({minus}19100 {plus minus} 300 cal mol{sup {minus}1}/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. The present results were equally well fit to the three parameter expression: k{sub 1}(T) = 4.93 {times} 10{sup {minus}18}T{sup 2.02} exp({minus}13400 cal mol{sup {minus}1}/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. Uncertainties in the Arrhenius expressions are given at the one standard deviation level and the mean deviation of the data from each expression is {plus minus}16%. Corresponding rate constants for the reverse reaction (reaction ({minus}1)) were computed from the known values of the equilibrium constant and were fitted to the Arrhenius equation: k{sub {minus}1}(T) = (8.9 {plus minus} 0.9) {times} 10{sup {minus}12} exp({minus}2100 {plus minus} 300 cal mol{sup {minus}1}/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. These direct experimental results for k{sub 1}(T) and k{sub {minus}1}(T) are compared with previously reported experimental measurements and with available theoretical expressions.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6382038
• Report Number(s): BNL-44484; CONF-900704-12; ON: DE91004013
• Resource Relation: Conference: 23. internatinal symposium on combustion, Orleans (France), 22-27 Jul 1990
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
OXYGEN
CHEMICAL REACTION KINETICS
WATER
ARRHENIUS EQUATION
COMBUSTION
NITRIC OXIDE
PHOTOLYSIS
SHOCK TUBES
VERY HIGH TEMPERATURE
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
EQUATIONS
HYDROGEN COMPOUNDS
KINETICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry