Abstract
The dehydrogenation of cyclohexane vapor has been studied over nickel-on-silica catalysts in a flow system from 100 ° to 260 ° at atmospheric pressure. The fraction of cyclohexane converted to benzene ( C) was extremely low (about 0.01) between 100 ° and 180 °, while at 235 °, C increased to a maximum value around 0.25 and then rapidly decreased with further rise in temperature. In the range 150–220 °, the apparent activation energy was 30 ± 2 kcal/mole and the reaction rate dependence was zero order with respect to benzene, and first order with respect to cyclohexane and to the inverse of the hydrogen concentration. It is suggested that the slowest step in the reaction involves the initial formation, from adsorbed cyclohexane, of adsorbed cyclohexene and hydrogen. The results are contrasted and compared with earlier findings on benzene hydrogenation.
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