以纯硅silicalite-1为晶种制备空心结构ZSM-5沸石分子筛

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. The prepared hollow-structured ZSM-5 zeolite exhibited excellent olefin selectivity and catalytic stability during the methanol-to-olefin (MTO) reactions. This method is fast and facile, exhibiting wide potential for the large-scaled production of hierarchically porous hollow ZSM-5 zeolite.