ZnHZSM-5上甲醇芳构化反应的研究

Study of methanol to aromatics on ZnHZSM-5 catalyst

摘要: 通过浸渍法改性制得ZnHZSM-5催化剂，并采用XRD、BET、NH₃-TPD和Py-IR方法对催化剂进行表征。在连续流动固定床反应装置上考察了Zn负载量和反应条件对甲醇芳构化反应(MTA)的影响。结果表明,0.5%Zn负载量可使芳烃收率提高5%。当Zn负载量超过2%时，不仅不能提高芳烃收率，反而促使甲醇裂解成CO和CO₂，Zn负载量为1.0%～2.0%时芳构化活性较高。最佳反应条件为液体体积空速0.36h^-1~0.6h^-1，温度350℃。并对Zn改性下的甲醇芳构化反应过程进行了探讨。

Abstract: 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.