Abstract
The effects of temperature and hydrogen pressure on the hydrogenative ring opening of propylcyclopropane over Pt/SiO2 and Pd/SiO2 catalysts were studied. Temperature dependence in the 323–373 K temperature range in a pulse system was investigated, while a static recirculation reactor was used for hydrogen pressure dependence measurements. The ring-opening reactions took place exclusively at all temperatures and hydrogen pressures studied. Monotonous increase was observed for the reactivity of propylcyclopropane as a function of temperature. At constant temperature, the reaction rate vs. hydrogen pressure dependence curves passed through a maximum indicating dissociative adsorption over both Pt and Pd catalysts. The scission of the sterically less hindered direction (producing 2-methylpentane) was the major reaction pathway on both catalysts with practically identical regioselectivity values. On the basis of these results aselective mechanism was proposed for the ring-opening reaction.
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