Decomposition of water behind reflected shock waves

Journal Article · Thu Jun 15 04:00:00 EDT 1978 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100501a004· OSTI ID:6977240

Bopp, J M; Kern, R D; Niki, T

Water was introduced into a shock tube via two reactions: D/sub 2/ + O/sub 2/ and D/sub 2/ + CO/sub 2/. The decomposition was measured in an Ar--Kr diluent by recording the infrared emission from D/sub 2/O through an interference filter centered at 3.8 ..mu..m. The resulting intensity--time profiles were fit to a first-order decay equation. The apparent decomposition rate constants derived from both sets of data were found to be in good agreement in the temperature range 3600 to 4800 K after correcting for temperature increase due to the exothermicity of the D/sub 2/ + O/sub 2/ reaction. The Arrhenius equation for the combined set of pseudo-first-order apparent rate constants is k = 10/sup 14.1+-0.2/ exp (-100 +- 3/RT) cm/sup 3/ mol/sup -1/ s/sup -1/. The units for the activation energy are kcal mol/sup -1/. Computer simulation of the experimental decay profiles using literature values of the relevant reactions revealed good agreement between the results reported herein and the rate constants for dissociation derived from studies which employed premixed water--inert gas introduction systems. 6 figures; 5 tables.

• Research Organization: Univ. of New Orleans
• OSTI ID: 6977240
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 82:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
ACTIVATION ENERGY
ARGON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
DECOMPOSITION
DEUTERIUM
ELEMENTS
ENERGY
FLUIDS
HEAVY WATER
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFRARED SPECTRA
ISOTOPE EFFECTS
ISOTOPES
KINETICS
KRYPTON
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN
OXYGEN COMPOUNDS
QUANTITY RATIO
RARE GASES
REACTION KINETICS
SHOCK TUBES
SPECTRA
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
ULTRAHIGH TEMPERATURE
VERY HIGH TEMPERATURE
WATER
YIELDS