Hierarchical core/shell Zeolite Socony Mobil-five (ZSM-5) zeolite was hydrothermally postsythesized in the solution of NaOH and diammonium surfactant via a dissolution-reassembly strategy. The silica and alumina species were firstly dissolved partially from the bulky ZSM-5 crystals and then were in situ reassembled into the MFI-type nanosheets with the structure-directing effect of diammonium surfactant, attaching to the out-surface of ZSM-5 core crystals. The mesopores thus were generated in both the core and shell part, giving rise to a micropore/mesopore composite material. The micropore volume and the acidity of the resultant hybrid were well-preserved during this in situ recrystallization process. Possessing the multiple mesopores and enlarged external surface area, the core/shell ZSM-5 zeolite exhibited higher activity in the ketalation and acetalization reactions involving bulky molecules in comparison to the pristine ZSM-5.

通过溶解-重组策略，在NaOH和二铵表面活性剂溶液中水热后合成了分级核/壳沸石美孚五型（ZSM-5）沸石。首先从庞大的ZSM-5晶体中部分溶解二氧化硅和氧化铝，然后原位重组装成MFI型纳米片，并具有二铵表面活性剂的结构导向作用，并附着在ZSM-5核心晶体的外表面。因此，在核和壳部分都产生了中孔，从而产生了微孔/中孔复合材料。在此原位过程中，得到的杂种的微孔体积和酸度得到了很好的保存重结晶过程。与原始ZSM-5相比，具有多个中孔和更大的外部表面积，核/壳ZSM-5沸石在涉及大分子的缩酮化和缩醛化反应中显示出更高的活性。