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The nonoxidative dehydrogenation of alkylbenzenes (ethylbenzene, propylbenzene, and isopropylbenzene) has been carried out at 693–853 K on rhodium catalysts at 1 wt% supported on two different types of AlPO4. In similar experimental conditions, the specific catalytic activity of the Rh/AlPO4 catalysts is higher than that obtained previously for Ni/AlPO4 (20 wt%) catalysts. Besides, a linear free energy relationship (LFER) was also obtained, manifesting itself through a “compensation effect” between the ΔH≠ and ΔS≠ activation parameters obtained from the Eyring equation (and between ln A and Ea, from the Arrhenius equation). Furthermore, no extensive metal-support interaction effect was obtained as in the case of Ni/AlPO4 catalysts in spite of exhibiting the same concerted mechanism previously described for the nonoxidative dehydrogenation of alkylbenzenes on supported nickel catalysts.

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