Study of methanol to aromatics on ZnHZSM-5 catalyst

ZnHZSM-5 catalysts with different Zn loading were prepared by impregnation, and characterized by means of XRD, BET, NH₃-TPD and Py-IR. The effects of Zn content and reaction parameters on the conversion of methanol to aromatics were investigated in a fixed-bed down-flow reactor. The results showed: The yield of aromatics increased by 5% on ZnHZSM-5 with  Zn loading of 0.5%, but when the Zn loading was more than 2%, not only did the yield of aromatics decreased, but also the cracking reaction of methanol to carbon monoxide and carbon dioxide was enhanced. The highest aromatics yield among the Zn loading 1.0%～2.0%. The optimal LHSV and temperature were 0.36h^-1～0.6h^-1 and 350℃ respectively. Further more the procedure of the conversion of methanol to aromatics was discussed.