The synthesis of hierarchical MFI zeolites comprising orthogonally stacked bundles of zeolite nanosheets using a new type of triblock structure-directing agents (SDAs) was reported. The textural properties, including the degree of nanosheet branching and the spacing between adjacent nanosheets, could be controlled by changing the length of the linkers in the triblock SDAs. The hierarchical pure-silica silicalite-1 materials exhibited high and stable catalytic activity for the vapor-phase Beckmann rearrangement of cyclohexanone oxime with high selectivity of ε-caprolactam. On the other hand, the hierarchical ZSM-5 materials showed high adsorption capacity of Pb²⁺ ion following a Langmuir-type adsorption behavior. After being deposited with Pd nanoparticles, the hierarchical Pd/ZSM-5 nanocomposites exhibited high activity in the aqueous-phase hydrogenation of phenol to cyclohexanone at room temperature. The results show promise of the disclosed hierarchical zeolites for catalytic and adsorption applications.

报道了使用新型的三嵌段结构定向剂（​​SDA）合成包含正交堆叠的沸石纳米片束的分级MFI沸石。可以通过改变三嵌段SDA中接头的长度来控制包括纳米片支化程度和相邻纳米片之间的间距在内的纹理特性。分层的纯二氧化硅silicalite-1材料对环己酮肟的气相贝克曼重排表现出高而稳定的催化活性，并且对ε-己内酰胺具有高选择性。另一方面，分层的ZSM-5材料显示出高的Pb ²⁺吸附能力离子遵循Langmuir型吸附行为。在用Pd纳米颗粒沉积后，分层的Pd / ZSM-5纳米复合材料在室温下苯酚水相加氢成环己酮中表现出高活性。结果显示了所公开的分级沸石用于催化和吸附应用的希望。