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A series of Ga_2O_3/HZSM-5 catalysts of different Ga content havebeen prepared by physical mixing method.Propylene aromatization over thesecatalysts carried out in the pulse-microreaetor and flow-microreactor shows thatthe reaction depends strongly on the acidity of the zeolite.Ga_2O_3 supported onHZSM-5 points to a considerable effect on its activity and selectivity only whenreaction temperature is higher than 773K.Over Ga_2O_3/HZSM-5 pretreated inhydrogen at relatively high temperature,the activity and selectivity for propy-iene aromatization increase remarkably.The optimum pretreatment conditionfor catalyst is in hydrogen at 773K for 2h.And the suitable Ga content andspace velocity are about 1wt％ and 8-12g.mol~(-1).h respectively.Also,an ap-proach is made to the mechanism of propylene aromatization.
A series of Ga 2 O 3 / HZSM-5 catalysts of different Ga content have been prepared by the physical mixing method. Propylene aromatization over these catalysts carried out in the pulse-microreaetor and flow-microreactor shows that the reaction depends strongly on the acidity of the zeolite. Ga 2 O 3 supported onHZSM -5 points to a considerable effect on its activity and selectivity only when reactaction temperature is higher than 773K.Over Ga_2O_3 / HZSM-5 pretreated in hydrogen at relatively high temperature, the activity and selectivity for propy-ie aromatization increase remarkably. Optimum condition optimum condition catalyst is in hydrogen at 773K for 2h. And the suitable Ga content and space velocity are about 1wt% and 8-12g.mol ~ (-1) .h respectively. Also, an ap-proach is made to the mechanism of propylene aromatization.