Abstract
An inverse isotope effect and deuterium enrichments in hydrocarbons were observed in Fe catalyzed Fischer-Tropsch (FT) reactions. These results are explained by an Alkylidene mechanism by which the monomer of the polymerization-like reaction is MCH and the growing chain is RCH = M. The formation of CC bond is through the reaction of MCH and RCH = M, producing a new growing chain RCH2CH = M. During the process of CC bond formation, the sp2 carbon in RCH = M is changed to sp3 in newly formed growing chain RCH2CH = M, which results in an inverse isotope effect. The rate of reaction of RCD = M with MCH/M≡CD is fast than that of RCH = M with MCH/M≡CD. The calculations based on alkylidene mechanism showed that the deuterium is enriched in hydrocarbons and that the deuterium enrichment is a function of carbon number.
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