关键词: ZSM-5分子筛, 甲醇, 汽油, 催化, 焙烧温度

Abstract:

Using NaZSM-5 zeolite as raw material, the HZSM-5 catalysts were prepared by ion exchange method and characterized by XRD, FT-IR, and N2 adsorption-desorption. The effect of calcination temperature on the catalytic performance for methanol to gasoline (MTG) reaction was investigated in a micro-fixed bed reactor. The results show that the calcination temperature has an evident influence on the catalytic performance of the HZSM-5 catalysts. With increasing calcination temperature, the catalyst activity decreases as part of the channel in the HZSM-5 catalysts are blocked and the acid sites rapidly reduced. The HZSM-5 catalysts calcined at 550 ℃ exhibit a higher specific surface area of 351.1 m2/g, and higher pore volume of 0.311 cm3/g and pore diameter of 3.20 nm, leading to an optimal methanol conversion, gasoline yield and aromatics selectivity.

Key words: ZSM-5 zeolite, methanol, gasoline, catalysis, calcination temperature