Fundamental studies on coal-gasification mechanisms. Annual report, January 1984-January 1985
The objective of this study is to determine the reaction pathways responsible for the formation of low-molecular-weight hydrocarbons during coal pyrolysis. The approach utilizes a novel technique in which samples of Illinois No. 6 coal are first modified by the introduction of selected structural elements (some containing deuterium or C(sup 13) labels) known to exist in coal and then pyrolyzing them to determine the disposition of the added groups. Structural groups that have been added include O-methyl, O-methyl-d3, O-methyl-C(sup 13)C, O-ethyl, O-ethyl-d5, O-propyl, O-propyl-d7, C-methyl, C-methyl-d3, C-ethyl and C-propyl groups. Comparison of the yields and isotope distributions in the methane, ethane, ethene, propane and propene pyrolysis products suggests that these hydrocarbons are formed in multistep reversible reaction pathways as well as simple bond homolysis and hydrogen abstraction reaction pathways. The tars that evolved during pyrolysis were also characterized by both field ionization and high resolution mass spectrometry. The results of these experiments indicate that tar molecules are formed through at least two different reaction pathways.
- Research Organization:
- Institute of Gas Technology, Chicago, IL (USA)
- OSTI ID:
- 5579607
- Report Number(s):
- PB-85-188381/XAB
- Country of Publication:
- United States
- Language:
- English
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010404* -- Coal
Lignite
& Peat-- Gasification
010406 -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
CARBON 13
CARBON ISOTOPES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION PRODUCTS
DECOMPOSITION
DEUTERATION
EVEN-ODD NUCLEI
GASIFICATION
ISOTOPE RATIO
ISOTOPES
KINETICS
LIGHT NUCLEI
MASS SPECTROSCOPY
MOLECULAR STRUCTURE
NUCLEI
PYROLYSIS
REACTION KINETICS
SPECTROSCOPY
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES