以纯硅silicalite-1为晶种制备空心结构ZSM-5沸石分子筛

微孔分子筛在实际应用过程中常常受到扩散限制的影响，分子筛内部的利用率不高；制备空心结构分子筛对于改善分子筛扩散传质、提高分子筛利用率具有重要意义。以纯硅silicalite-1为晶种，以四丙基氢氧化铵(TPAOH)为结构导向剂制备ZSM-5分子筛；无定型硅铝物种首先在晶种表面晶化生长，同时碱性合成体系的碱度则可以溶解不稳定的silicalite-1晶种，通过控制调变生长与溶解的相对速率制备得到具有空心结构的ZSM-5分子筛；该多级孔道ZSM-5分子筛的制备方法简单、易操作，具有广泛的应用潜力。

Synthesis of Hollow-structured ZSM-5 Using Silicalite-1 as Seeds

Microporous zeolites usually suffered from diffusion limitation during the applications, leading to the incomplete utilization of the zeolites. The hollow-structured zeolites are helpful in enhancing the molecular diffusion and improving the utilization of the zeolites. In this paper, hollow-structured ZSM-5 was prepared by using silicalite-1 as seeds and tetrapropylammonium hydroxide as the structure-directing agent. The silicalite-1 crystals serving as the seeds were not as stable as the freshly formed Al-containing ZSM-5 in the alkaline medium. They dissolved and further served as the nutrition species, forming the hollow structure. This method is fast and facile, exhibiting wide potential for the large-scaled production of hierarchically porous hollow ZSM-5 zeolite.