【摘 要】
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A facile approach was developed for the preparation of nano-sized HZSM-5 with a hierarchical mesoporous structure by adding imidazole into conventional zeolite synthesis precursor solution.The physicochemical properties of modified HZSM-5 were characteriz
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A facile approach was developed for the preparation of nano-sized HZSM-5 with a hierarchical mesoporous structure by adding imidazole into conventional zeolite synthesis precursor solution.The physicochemical properties of modified HZSM-5 were characterized by X-ray diffraction (XRD),N2 adsorption-desorption isotherms,scanning electron microscopy (SEM),NH3-temperature-programmed desorption (NH3-TPD) and pyridine adsorption infrared spectroscopy (Py-IR).The coke in spent catalysts was characterized by thermogravimetry (TG).The results showed that hierarchical HZSM-5 zeolites with excellent textural properties,such as abundant porous structure,uniform particle size and suitable acidity,could be synthesized by the recipe of one-pot synthesis routes.Moreover,the obtained HZSM-5 exhibited higher selectivity of total aromatics as well as longer lifetime in the catalytic conversion of methanol to aromatics,comparing with conventional HZSM-5.It is expected that the synthesis approach demonstrated here will be applicable to other zeolites with particular textural properties and controllable particle sizes,facilitating the emergence of new-type porous materials and their related applications in catalysis and separation.
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