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Literature Abstracts

 1950.    KÖLBEL, H., AND ACKERMANN, P.  [Reaction Mechanism of the Fischer-Tropsch Synthesis.  IV.  Molecular Size of the Aliphatic Hydrocarbons From the Catalytic Hydrogenation of Carbon Monoxide.]  Brennstoff-Chem., vol. 31, 1950, pp. 10-14; Chem. Abs., vol. 44, 1950, p. 3697.

        When higher-molecular liquid aliphatic hydrocarbons (C₁₅-C₁₉ hydrocarbons from Kogasin) are introduced into the Fischer-Tropsch synthesis, they form solid hydrocarbons by chain lengthening under synthesis conditions that normally lead to the predominant formation of high molecular hydrocarbons, solid at normal temperatures.  The rate of this chain lengthening is directly related to the building up activity of the catalyst.  As regards the synthesis-gas mixture (used along with the higher hydrocarbons), 45-57 gm. of solid hydrocarbons are formed per m.³ of the CO-H₂ mixture.  Two different Kogasin fractions were used, containing 2 and 11% of olefins, respectively.  No difference could be noted as to their reactivity.  Reviews theories as to the reaction mechanism.