PREPARATION OF Ni/ZnO-Zn/ZSM-5 BIFUNCTIONAL COUPLING CATALYST AND COUPLED AROMATIZATION DURING REACTIVE ADSORPTIVE DESULPHURIZATION
In the process of fluid catalytic cracking(FCC)gasoline deep desulfurization,olefin saturation exists in the traditional Ni/ZnO adsorbent,which results in the loss of octane number.In order to solve this problem,reactive adsorptive desulfurization coupling olefin aromatization reaction was attempted by introducing Zn-ZSM-5 into Ni/ZnO component.Bifunctional coupled Ni/ZnO-Zn/ZSM-5 catalyst was prepared by the equal volume impregnation method,the performances of coupling catalysts for desulfurization and olefin aromatization were evaluated,and the effects of Ni content and Ni partition ratio on ZnO and Zn/ZSM-5 were investigated.The results showed that the catalyst had the best catalytic performance at a reaction temperature of 450 ℃ when the mass fraction of Ni content was 6％and the ratio of Ni to ZnO and Zn/ZSM-5 was 1∶1.The aromatics generation rate of 38.58％and the liquid yield rate of 88.33％could be achieved.The operating temperature of the process was optimized and the regeneration performance of the catalyst was examined.At 420 ℃,the desulphurization rate,olefin conversion rate and aromatics generation rate of 6％Ni/ZnO-Zn/ZSM-5(1∶1)catalyst were 98.7％,54.0％and 29.7％,respectively,and the loss of octane number was reduced by 0.69 compared with that of the conventional Ni/ZnO desulphurization reaction.In addition,the process exhibited excellent desulfurization and aromatization performance in multiple regeneration cycles,demonstrating the feasibility of continuous processing.
FCC gasolinereactive adsorptive desulfurizationaromatizationoctane number
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