Rate constant for the reaction H + NH/sub 3/ over the temperature range 750-1777 K
The rate constant for the reaction of atomic hydrogen with ammonia has been measured over the temperature range 908-1777 K by the flash photolysis-shock tube technique using atomic resonance absorption to monitor (H)/sub t/. The Arrhenius rate expression is k/sub 1/ = (3.02 +/- 0.30) x 10/sup -10/ exp(-8067 +/- 117/T) cm/sup 3/ molecule/sup -1/ s/sup -1/. The rate constant was also measured at 750 K by the flash photolysis-resonance fluorescence (FP-RF) method: k/sub 1/ = (1.27 +/- 0.18) x 10/sup -14/ cm/sup 3/ molecule /sup -1/ s/sup -1/. Detailed analysis of the kinetic data revealed that the Arrhenius plot is slightly nonlinear, and the shock tube data can be expressed by the three-parameter equation k/sub 1/ = 1.06 x 10/sup -18/T/sup 2.39 exp(-5119/T) cm/sup 3/ molecule/sup -1/ s/sup -1/. This result is compared to that from a theoretical calculation, k/sub 1/ = 1.16 x 10/sup -17/ T/sup 2.17 exp (-6268/T) cm/sup 3/ molecule/sup -1/ s/sup -1/ for 600 less than or equal to T less than or equal to 2600 K. Accepting the nonlinearity of the Arrhenius plot, the rate constant results from the two independent experimental techniques are in satisfactory agreement. 13 references, 2 figures, 3 tables.
- Research Organization:
- Brookhaven National Lab., Upton, NY
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6038298
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:3; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ABSORPTION
ABSORPTION SPECTROSCOPY
AMMONIA
ARRHENIUS EQUATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
KINETICS
MEETINGS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REACTION KINETICS
RESONANCE ABSORPTION
SHOCK TUBES
SPECTROSCOPY
VERY HIGH TEMPERATURE