High-temperature photochemistry kinetics study of the reaction of O(/sup 3/P) atoms with acetylene from 290 to 1510 K

Journal Article · Thu Mar 26 04:00:00 EST 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100291a047· OSTI ID:6800036

Mahmud, K; Fontijn, A

Overall rate coefficients for the O + C/sub 2/H/sub 2/ reaction have been measured in a high-temperature photochemistry (HTP) reactor at temperatures from 290 to 1510 K and pressures from 120 to 630 Torr. Ground-state O atoms were generated from flash photolysis of O/sub 2/ or CO/sub 2/ and monitored by time-resolved atomic resonance fluorescence with pulse counting. Measurements were made under pseudo-first-order conditions (O) << (C/sub 2/H/sub 2/). Rate coefficients from 290 to 1300 K are in good agreement with flow reactor measurements in that range. The strongly curved arrhenius-type plot obtained is contiguous with that found in recent shock tube work from 1500 to 2600 K. A weighted fit to the authors measurements leads to the expression k(T) = 1.1 x 10/sup -19/T/sup 2.6/ exp(-330K/T) cm/sup 3/ molecule/sup -1/ s/sup -1/. Combining the present data set with other experimentally determined k values yields, for the 290 to 2600 K temperature range, k(T) = 3.6 x 10/sup -20/T/sup 2.8/ exp(-250K/T) cm/sup 3/ molecule/sup -1/ s/sup -1/; the accuracy is assessed as 35% at the 1sigma confidence level.

• Research Organization: Rensselaer Polytechnic Institute, Troy, NY
• OSTI ID: 6800036
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACETYLENE
ALKYNES
ARRHENIUS EQUATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
ENERGY LEVELS
EQUATIONS
EXPERIMENTAL DATA
GROUND STATES
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
KINETICS
MEDIUM TEMPERATURE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REACTION KINETICS
VERY HIGH TEMPERATURE