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A New Mechanism for the Formation of Meteoritic Kerogen-Like Material
Windsor A. Morgan, Jr., Eric D. Feigelson, Hai Wang and Michael Frenklach
New Series, Vol. 252, No. 5002 (Apr. 5, 1991), pp. 109-112
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/2875583
Page Count: 4
You can always find the topics here!Topics: Polycyclic aromatic hydrocarbons, Solar nebulae, Methane, Hydrocarbons, Molecules, Meteorites, Composite materials, Interstellar clouds, Chemicals, Aromatic hydrocarbons
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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 Fischer-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.
Science © 1991 American Association for the Advancement of Science