Abstract
Abstract The structure of Fe 2 O 3 -K 2 CO 3 dehydrogenation catalyst and the reaction rout of ethylbenzene dehydrogenation were studied. Formation of double oxides, KFeO 2 and K 2 Fe 22 O 34 , was found by solid state reaction of Fe 2 O 3 and K 2 CO 3 , but only KFeO 2 was stable in the condition of dehydrogenation reaction. The equilibrium pressure of CO 2 in the solid state reaction was measured and the stability of KFeO 2 in the dehydrogenation condition was suggested. By means of hydrogen-deuterium exchange of ethylbenzene, the participation of the hydrogen attached to α-position of ethyl group was found. It was suggested that ethylbenzene adsorbed on the catalyst by reversible dissociation of α-hydrogen. The rate of exchange was compared for different alkylbenzene and the following order was observed; toluene>ethylbenzene>cumene. This order suggests that the exchange proceeds by heterolytic abstraction of α-hydrogen as H + on basic sites of the catalyst surface.
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