Abstract
In the present paper the question has been studied whether the methane formed in great quantities during the hydrogenation of carbon monoxide with hydrogen in the Fischer-Tropsch synthesis may be generated by catalytic hydrocracking of primarily formed higher molecular weight hydrocarbons. The studies were conducted with precipitated Co, Fe, and Ni carrier-type catalysts using 14C labeled compounds. It has been shown that under normal synthesis conditions with Co and Ni catalysts the percentage of methane formed by catalytical hydrocracking of primarily obtained hydrocarbons related to the total methane formed is only about 5%. The corresponding value for Fe catalysts is below 3%. Above 204 °C with Ni catalysts and above 213 °C with Co catalysts noticeable increase of the formation of methane by hydrocracking reactions was observed, the percentage of cracking methane for synthesis with Fe catalysts being largely independent of temperature.
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