期刊
METEORITICS & PLANETARY SCIENCE
卷 35, 期 4, 页码 841-848出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1945-5100.2000.tb01467.x
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Detailed laboratory studies have been carried out in order to simulate the interaction between nanometer-sized kamacite metal particles and different gas mixtures consisting of H(2):H(2)S (250:0.1), H(2):CO (250:1), and H(2):CO:H(2)S (250:1:0.1) under nebular-type conditions (5 x 10(-4) atm and 473 K). Reaction of H(2) + H(2)S with kamacite particles for 1000 h leads to the formation of pyrrhotite. Incorporation of CO into the gaseous reactant mixture results in the formation of both sulfide and carbide phases. At the same time, amorphous C is deposited onto the metal particles and organic molecules are evolved, namely hydrocarbons and thiols in the C(1)-C(5) and C(1)-C(2) range, respectively. Carbon deposition and production of organics are enhanced with respect to experiments performed with H(2) + CO, where a carbide phase is formed. There is no evidence for the existence of S-poisoning effects on the metal-catalysed hydrogenation of CO through Fischer-Tropsch-type reactions in nebular environments. In fact, it is experimentally demonstrated that S-containing organic species could be synthesized by such reactions from nebular gas.
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