Abstract
The hydrogenation of benzene on a nickel-silica catalyst was measured in a differential flow reactor with glc analysis of the reaction products. The parameters varied over wide intervals. The order of reaction with respect to hydrogen rose from 0.5 at 25 °C to 2–3 at 200 °C. The order of reaction with respect to benzene rose from about 0.1 at 25 °C to 0.3–0.5 at 200 °C. No inhibition of cyclohexane could be detected. The apparent activation energies in the temperature range 25–120 °C decreased from 12.5 kcal/mol at 600 Torr hydrogen pressure to 11.7 kcal/mol at 75 Torr. At higher temperatures a maximum appeared in the reaction rate. Depending on hydrogen pressure (75–600 Torr) the temperature of the maximum shifted from 135 to 180 °C. Neither poisoning, nor diffusion limitation, nor approach to equilibrium could account for the maximum.
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