Highly Active HPA Based Complex Solid Acidic Material For Hydroprocessing Of FCC Gasoline

HPA has been applied in the fields of acid catalysis and oxidation-reduction catalysis fortheir controllability in structure and variability in their function. The nano-HZSM-5zeolitecontains the dual channel structure, in which the dispersing route of the reactants mixturewould be relatively short. The secondary pores between the crystalline had been considered asa ideal material to load the HPA. It is a reasonable way to assemble the HPA into the structureof nano-HZSM-5zeolite to control and synthesize the HPA loaded solid catalysts.FCC gasoline occupies more than80%of commercial gasoline in Chinese market. Itcontains very high levels of olefins and sulfur compounds. Hydrodesulfurization （HDS） is theessential process for this problem. But these techniques frequently results in the saturation ofolefins and cause a loss to octane number. Therefore, it is necessary to develop the technologyof reducing the most of the olefin and sulfur and causes a small reduction in the octanenumber in the meantime, the technology for FCC gasoline upgrading process is a key toresolve problem of cleansing gasoline.In this paper, the catalysts of nano-HZSM-5-supported the Keggin HPA and Ni （II） wereprepared by impregnation technique. The catalysts were characterized by FT-IR, XRD, TG,Raman and BET. These results can indicate the structure of the catalysts. In thehydrodesulfurization （HDS） or hydrodenitrogenation （HDN） reaction of FCC gasoline, thecatalysts show their catalytic stability and activity.（1） The characterized results indicate that the Keggin structure of HPA and theframework structure of the ZSM-5material are essentially preserved on the catalysts, whenthe temperature of calcinations arrived at350oC.And the HPA and Ni （II） highly disperse onthe outer surface of the support or engage in the intergranular secondary pores ofnanocrystalline HZSM-5zeolite.（2） The catalytic performance of nano-HZSM-5-supported（10wt%） HPA and Ni （II） isoptimal.（3） As a result of the HDS test, HPA catalysts supported on nanoscale HZSM-5zeolitesshowed better performance in deep hydrodesulfurization of FCC gasoline than thecounterparts supported on Al₂O₃, The reason for the high catalytic activity of the H-ZSM-5supported HPA catalysts is irrespective to Al₂O₃，though nanoscale HZSM-5zeolites which were stripped by Al₂O₃.In addition, Mo-based catalysts show a higher catalytic performancethan their respective W-based analogues.（4） Two catalysts of nanocrystalline HZSM-5zeolite supported phosphovanadomolybdicacid and Ni show the high activity in reducing olefins, the activity of atomization, the HDSand HDN activity.