Upper limit for the methane-oxygen initiation reaction in the presence of iodine-131 behind reflected shock waves
Technical Report
·
OSTI ID:5216523
A one-inch diameter single-pulse shock tube was used to study the rate of methyl iodide formation from 815 to 1151K via the reaction CH/sub 4/ + I ..-->.. CH/sub 3/ + HI with the observed rate constant k/sub 40/ = 10/sup 14/ /sup 5/ exp(-33.7/RT) cm/sup 3//mole sec. Tracer quantities of iodine-131 were used to follow the course of the reaction. At 1097K in a stoichiometric methane-oxygen reaction mixture with small amounts of iodine present, the methane-oxygen initiation reaction, CH/sub 4/ + O/sub 2/ ..-->.. CH/sub 3/ + HO/sub 2/, was not found to occur, thus putting an upper limit on the rate constant k/sub 2/ = 9.53 x 10/sup 5/ cm/sup 3//mole s. Mass-spectral analysis of the reaction products from the above experiment indicated that formaldehyde was formed; at 1097K oxygen was able to successfully compete with iodine for methyl radicals. The rate constant for the reaction, CH/sub 3/ + O/sub 2/ ..-->.. CH/sub 2/O + OH, was found to be k/sub 4/ = 3.96 x 10/sup 10/ cm/sup 3//mole s.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5216523
- Report Number(s):
- IS-T-984; ON: DE84007366
- Country of Publication:
- United States
- Language:
- English
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Upper limit for the methane-oxygen initiation reaction in the presence of iodine-131 behind reflected shock waves
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALDEHYDES
ALKANES
ALKYL RADICALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION
DAYS LIVING RADIOISOTOPES
FORMALDEHYDE
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INTERMEDIATE MASS NUCLEI
IODINATED ALIPHATIC HYDROCARBONS
IODINE 131
IODINE ISOTOPES
ISOTOPES
METHANE
METHYL IODIDE
METHYL RADICALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
OXIDATION
RADICALS
RADIOISOTOPES
SHOCK TUBES
THERMOCHEMICAL PROCESSES
YIELDS
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALDEHYDES
ALKANES
ALKYL RADICALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION
DAYS LIVING RADIOISOTOPES
FORMALDEHYDE
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INTERMEDIATE MASS NUCLEI
IODINATED ALIPHATIC HYDROCARBONS
IODINE 131
IODINE ISOTOPES
ISOTOPES
METHANE
METHYL IODIDE
METHYL RADICALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
OXIDATION
RADICALS
RADIOISOTOPES
SHOCK TUBES
THERMOCHEMICAL PROCESSES
YIELDS