Return to Abstracts of Literature
Return to Abstracts of Literature 1750-1999
Literature Abstracts
1822. ---------------. [KOCH, H., AND GILFERT, W.] [Breaking Down and Building Up of Hydrocarbons Under Hydrogenating Conditions Over the Cobalt Catalyst Used in Fischer-Tropsch Syntheses.] Brennstoff-Chem., vol. 30, 1949, p. 213-218; Chem. Zentralb., 1950, I, p. 1302; Chem. Abs., vol. 43, 1949, p. 7663.
Various hydrocarbons in vapor form mixed with H2 and CH4 were recirculated at 200° over a reduced Co catalyst used for Fischer-Tropsch syntheses. The paraffin hydrocarbons n-C6H14, n-C7H16, n-C8H18, and 2-methylpentane in a current of H2 were broken down by demethylation, about half of the hydrocarbon being converted. In addition to shortening the C chain, there was also a distinct building up to the next higher homolog. Isomerization also occurred to a slight extent, and some aromatization occurred with 2-methyl-pentane. With n-C6H14 mixed with the circulating gas containing cH4 considerable chain lengthening to C7H16 took place, presumably because of combination with cH4. In CH4 without H2, the n-C6H14 remained unchanged. Toluene was formed to a surprising extent by the conversion of cyclohexane in a stream of H2. At the same time, C6H6 was formed by dehydrogenation and cyclopentane, by way of isomerization, to methyl-cyclopentane followed by demethylation. Benzene reacted with H2 to form toluene, but this conversion was relatively slow. No increase of the toluene yield was produced by adding CH4 to the circulating gas.