Pyrolysis of compounds containing polycyclic aromatic moieties
- Dept. of Chemical Engineering, Univ. of Michigan, Ann Arbor, MI (US)
Coal is thought to exist in a complex, cross-linked, macromolecular framework in which polycyclic moieties are covalently linked together by aliphatic and heteroatomic bridges. The condensed aromatic groups can also bear peripheral, non-bridging moieties, including long aliphatic chains. The pryolysis of numerous compounds mimicking these structural features has provided considerable insight to the thermal reactions of coal. Previous pyrolyses were typically of compounds containing a single aromatic ring, which was intended to mimic the more massive condensed aromatic moieties in coal. It is possible, however, that single-ring compounds might not display the same reaction pathways and kinetics as otherwise identical compounds containing polycyclic aromatic moieties. One difference between a single aromatic ring and the condensed aromatic moieties in coal is their sizes. This difference suggests that the model-compound-derived free radicals could be considerably more mobile than their coal-derived counterparts. To probe the influence of radical mobility on pyrolysis pathways Poutsma and coworkers pyrolysed coal model compounds immobilized on silica surfaces. They found that surface immbolization can lead to an enhancement of unimolecular pathways relative to bimolecular ones. In an attempt to gain additional insight into the fundamentals of coal pyrolysis, and particularly the effects of condensed aromatics, they recently initiated experiments with compounds containing polycyclic aromatic moieties, which better represent the aromatic clusters in coal than do single-ring compounds. In this paper, the authors report on the pyrolysis of two compounds; 2-(3-phenylpropyl)-naphthalene (PPN), and 1-dodecylpyrene (DDP).
- OSTI ID:
- 6597265
- Report Number(s):
- CONF-8806136-
- Journal Information:
- Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States), Vol. 33:2; Conference: American Chemical Society Division of Fuel Chemistry meeting, Toronto, Canada, 5 Jun 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
MOLECULAR STRUCTURE
PYROLYSIS
POLYCYCLIC AROMATIC HYDROCARBONS
THERMODYNAMICS
AROMATICS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
MATERIALS
ORGANIC COMPOUNDS
THERMOCHEMICAL PROCESSES
010409* - Coal
Lignite
& Peat- Pyrolysis & Carbonization- (1987-)
010600 - Coal
Lignite
& Peat- Properties & Composition