The influence of hydrogen on the kinetics of plasmapyrolytic methane conversion
The plasma pyrolysis of methane in the presence of excess hydrogen was kinetically modeled by means of a single pulse shock tube (SPST) technique. Pyrolytic decomposition of methane and the product formation including quenching was investigated as a function of temperature and dwell time in order to elucidate the kinetic role of hydrogen. Methane pyrolysis with an excess of hydrogen leads to lower conversion degrees and lower product yields as compared to pure methane. The decay curves may be described kinetically by first- and second-order ate equations, depending on reaction conditions. An excess of hydrogen causes a decrease in the overall rate constants for the methane decomposition and a ''straightening'' of the Arrhenius plots. According to the reaction mechanisms the recombination of primary radicals, especially CH/sub 3/, with H/sub 2/ molecules and H atoms is significant.
- Research Organization:
- Zentralinstitut fur Physicalische Chemie, Berlin
- OSTI ID:
- 5240844
- Journal Information:
- Plasma Chem. Plasma Process.; (United States), Vol. 5:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETYLENE
CHEMICAL REACTION YIELD
HYDROGEN
CHEMICAL REACTION KINETICS
METHANE
PLASMA JETS
PYROLYSIS
ARRHENIUS EQUATION
DISSOCIATION
PYROLYSIS PRODUCTS
QUANTITY RATIO
RADICALS
RECOMBINATION
SHOCK TUBES
TEMPERATURE DEPENDENCE
ALKANES
ALKYNES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
EQUATIONS
HYDROCARBONS
KINETICS
NONMETALS
ORGANIC COMPOUNDS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
YIELDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)