1998
DOI: 10.1111/j.1945-5100.1998.tb01629.x
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Abstract: Abstract-The reaction between kamacite grains and H2 + CO gas mixture has been tested in the laboratory under experimental conditions presumed for interplanetary dust particle (IDP) formation in a nebular-type environment (H2:CO = 250: 1 ; 5 x 10-4 atm total pressure, and 473 K). Carbon deposition, hydrocarbon production in the C1-C4 range, and the formation of an €-carbide phase occur when well-defined model FeNi bcc alloy (kamacite) particles are exposed to a mixture of H2 + CO during 103 h. These results st… Show more

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Cited by 30 publications
(26 citation statements)
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References 70 publications
(49 reference statements)
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“…Metallic Fe is an excellent catalyst for Fischer‐Tropsch‐type (FTT) catalytic synthesis of organics, a mechanism that has been widely proposed for the formation of carbonaceous materials in carbonaceous chondrites and interplanetary dust particles (e.g., Hayatsu and Anders 1981; Bradley et al. 1984; Llorca and Casanova 1998, 2000). Brearley (1990) also proposed that the association of graphitic C with Fe, Ni metal in several unequilibrated ordinary chondrites (UOC) probably resulted from FTT catalytic reactions.…”
Section: Discussionmentioning
confidence: 99%
“…Metallic Fe is an excellent catalyst for Fischer‐Tropsch‐type (FTT) catalytic synthesis of organics, a mechanism that has been widely proposed for the formation of carbonaceous materials in carbonaceous chondrites and interplanetary dust particles (e.g., Hayatsu and Anders 1981; Bradley et al. 1984; Llorca and Casanova 1998, 2000). Brearley (1990) also proposed that the association of graphitic C with Fe, Ni metal in several unequilibrated ordinary chondrites (UOC) probably resulted from FTT catalytic reactions.…”
Section: Discussionmentioning
confidence: 99%
“…Like those observations, the grains studied here consist of poorly crystallized graphite in intimate association with larger crystals of FeNi metal, in some cases with evidence for carbide at metal-C interfaces. These microstructures match those formed by catalytic reaction of C-bearing gases such as CO on metal surfaces to produce hydrocarbons, elemental carbon, and carbides (e.g., Fischer-Tropsch-type or FTT processes, Hindermann et al, 1993;Llorca and Casanova, 1998) and this appears to have played a role in forming the structures observed both in IDPs and in ordinary chondrites (Bradley et al, 1984;Brearley, 1990;Llorca and Casanova, 1998). The similarity of the graphite grains in the metalpoor lithology of GRA 95209 to these other materials indicates that they most likely formed by a similar process.…”
Section: Origin and Evolution Of Graphitementioning
confidence: 99%
“…He showed that the efficiency varied with the type of catalyst but that iron metal was the most effective. Llorca and Casanova (1998) reported on a study of the synthesis of hydrocarbons along with the carbonization of the metal grains using carefully characterized FeNi metal particles supported in a high-surface-area silica aerosil under the following conditions: 5 × 10 −4 bar, 473 K, and a ratio of H 2 /CO = 250.…”
mentioning
confidence: 99%