A series of hierarchical ZSM-5 aggregates with a relatively low SiO₂/Al₂O₃ ratio (~ 50) were successfully synthesized using alkali-treated commercial ZSM-5 as seeds and cetyltrimethylammonium bromide (CTAB) as mesogenous template. The effect of the amounts of CTAB on the physicochemical and catalytic properties of the synthesized catalysts was characterized by XRD, FE-SEM, FE-TEM, N₂ physical adsorption, ICP-OES, NH₃-TPD, Py-IR and TGA. Moreover, the possible formation mechanism of the hierarchical ZSM-5 aggregates was studied. The results indicated that the mesoporosity of the hierarchical ZSM-5 aggregates was greatly enhanced with the addition of CTAB. The primary crystal size of the ZSM-5 aggregates significantly decreased owing to the protective effect of CTAB, which inhibits the further crystal growth. The hierarchical ZSM-5 aggregates prepared with addition of a suitable amount of CTAB showed large specific surface areas and large external surface areas, abundant intercrystalline mesopores and appropriate concentration of acid sites, which resulted in excellent catalytic performance in the methanol to gasoline reaction. The stability of the catalyst was remarkably improved and the gasoline yield was given a rise of 10% compared with the catalyst prepared in the absence of CTAB.

中文翻译：

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碱处理种子法与十六烷基三甲基溴化铵催化甲醇制汽油反应合成分级ZSM-5聚集体

使用碱处理的商品ZSM-5作为种子和十六烷基三甲基溴化铵（CTAB）作为介晶模板，成功合成了一系列具有相对较低SiO ₂ / Al ₂ O ₃比（〜50）的分层ZSM-5聚集体。通过XRD，FE-SEM，FE-TEM，N ₂物理吸附，ICP-OES，NH ₃表征了CTAB用量对合成催化剂的理化和催化性能的影响。-TPD，Py-IR和TGA。此外，研究了分层ZSM-5聚集体的可能形成机理。结果表明，通过添加CTAB，ZSM-5分层聚集体的介孔性大大提高。由于CTAB的保护作用，ZSM-5聚集体的初生晶体尺寸显着减小，从而抑制了进一步的晶体生长。加入适量CTAB制备的分层ZSM-5聚集体显示出大的比表面积和大的外表面积，丰富的晶间介孔和适当的酸中心浓度，从而在甲醇转化为汽油的反应中具有出色的催化性能。