Computer Science
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252..109m&link_type=abstract
Science (ISSN 0036-8075), vol. 252, April 5, 1991, p. 109-112. USAF-supported research.
Computer Science
21
Chemical Evolution, Cosmochemistry, Kerogen, Meteoritic Composition, Acetylene, Aliphatic Compounds, Carbonaceous Chondrites, Cyclic Hydrocarbons, Methane, Pyrolysis
Scientific paper
The carbon in ancient carbonaceous chondritic meteorites is mainly in a hydrocarbon composite similar to terrestrial kerogen, a cross-linked structure of aliphatic and aromatic hydrocarbons. Until recently, the composite has been commonly thought to have been produced in the early solar nebula by a Fisher-Tropsch-type process, involving the catalytic synthesis of hydrocarbons from carbon monoxide and hydrogen on grain surfaces. Instead, the aromatic hydrocarbons may form in gas-phase pyrolysis of simple aliphatics like acetylene and methane by a mechanism developed recently to explain formation of soot in combustion and of aromatic molecules in circumstellar envelopes. Nonequilibrium chemical kinetic calculations indicate that this mechanism can produce meteoritic aromatics if the initial concentration of simple hydrocarbons in the solar nebula was sufficiently but not unreasonably high.
Feigelson Eric D.
Frenklach Michael
Morgan Windsor Anthony Jr.
Wang Hai-Hong
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