A shock tube study of reactions of C atoms with H sub 2 and O sub 2 using excimer photolysis of C sub 3 O sub 2 and C atom atomic resonance absorption spectroscopy

Journal Article · Wed Jan 09 23:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100154a037· OSTI ID:5773794

Dean, A J; Davidson, D F; Hanson, R K ^[1]

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1. Stanford Univ., CA (USA)

The reactions of C({sup 3}P) with H{sub 2} and O{sub 2} were studied at high temperature in reflected shock wave experiments. C atoms were detected at 156.1 nm by atomic resonance absorption spectroscopy (ARAS). Controlled levels of C atoms for calibrating the ARAS diagnostic were made by high-temperature pyrolysis of highly dilute CH{sub 4}/Ar mixtures. For kinetics experiments, C atoms were formed by pyrolysis of C{sub 3}O{sub 2} above 2,300 K and by ArF excimer photolysis of C{sub 3}O{sub 2} below 2,050 K. Formation of C atoms in the presence of excess H{sub 2} or O{sub 2} permitted first-order rate coefficient determinations of the reactions C({sup 3}P) + H{sub 2} {yields} CH + H (1) and C({sup 3}P) + O{sub 2} {yields} CO + O(2), yielding k{sub 1} = 4.0 {times} 10{sup 14} exp({minus}11,700 K/T) ({plus minus} 50%) cm{sup 3} mol{sup {minus}1} s{sup {minus}1}, over the temperature range 1,525-2,540 K and pressure range 0.5-1.2 atm, and k{sub 2} = 1.2 {times} 10{sup 14} exp({minus}2,010 K/T) ({plus minus} 50%) cm{sup 3} mol{sup {minus}1} s{sup {minus}1}, over the temperature range 1,500-4,200 K.

• OSTI ID: 5773794
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:1; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ABSORPTION SPECTROSCOPY
CARBON
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION KINETICS
DATA
DECOMPOSITION
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
KINETICS
MEASURING METHODS
NONMETALS
NUMERICAL DATA
OXYGEN
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REACTION KINETICS
SHOCK TUBES
SPECTROSCOPY
VERY HIGH TEMPERATURE