Novel nanotube assembly and hierarchical ZSM‐23 zeolite can be fabricated by using the low‐cost and commercial cationic polymer of polydiallyldimethylammonium chloride (polyDDA) in the synthesis gel. In this facile synthesis, the polyDDA plays roles as the growth inhibitor for nanosized crystals and the secondary porogen. This unique crystal structure shows tubular nanocrystals assembling to form agglomerates. This hierarchical structure combines intercrystalline mesopore and narrow macropore to the micropore of ZSM‐23. Double advantages of nanocrystal and hierarchical structure contribute to higher pore mouths and enhanced diffusion of the reaction molecules. The hierarchical form also benefits for simple crystal recovery of nanozeolite by filtration. The n‐heptane hydroisomerization shows the derived Pt/H‐ZSM‐23 outperforms the conventional Pt/H‐ZSM‐23 with higher isomer yield at higher conversion and less cracked product yield. This could be attributed to higher pore mouths and efficient mass transport because of the shorter diffusion path length by the smaller crystal and hierarchical structure supplementing pore‐to‐pore connection of the molecular transport.

中文翻译：

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阳离子聚合物合成的杂化纳米管组装件和分层ZSM-23沸石，并增强了正庚烷加氢异构化的性能

可以通过在合成凝胶中使用聚二烯丙基二甲基氯化铵（polyDDA）的低成本商业阳离子聚合物来制造新型纳米管组件和分层ZSM-23沸石。在这种简便的合成中，polyDDA充当纳米晶体和次生致孔剂的生长抑制剂。这种独特的晶体结构显示管状纳米晶体组装形成团聚物。这种分层结构将晶间中孔和窄大孔结合到ZSM-23的微孔中。纳米晶体和分层结构的双重优势有助于提高孔口和增强反应分子的扩散。分级形式也有利于通过过滤简单回收纳米沸石的晶体。正庚烷加氢异构化显示，衍生的Pt / H-ZSM-23优于常规Pt / H-ZSM-23，异构体收率更高，转化率更高，裂解产物收率更低。这可能归因于较高的孔口和有效的质量传输，这是由于较小的晶体和分级结构补充了分子迁移的孔-孔连接，从而缩短了扩散路径的长度。