Abstract
ZSM-5 zeolites were modified by desilication with sodium acetate and sodium citrate. The physicochemical properties of ZSM-5 zeolites, such as crystal structure, acid content, surface area and pore volume, were characterized by XRD, SEM, NH3-TPD, 27Al MAS NMR, pyridine adsorption infrared spectroscopy and N2 adsorption-desorption isotherms. Theresultsindicatethat pore size of the zeolite increases and mesoporous structures are formed by alkali modification, and the amount of Lewis and Brönsted acid contents decreased obviously. When the concentration of sodium acetate solution is 0.5 mol/L, the modified zeolite has a suitable B/L value for the aromatization of methanol while forming a large number of mesoporous structures. Compared with microporous ZSM-5, the catalyst life is increased from 20 h to 74 h, and the highest yield of aromatics is increased from 20.97% to 40.05%.
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