Self-seeded growth of very large open-structured zeolite nanosheet assemblies with extraordinary micropore accessibility
Self-seeded growth of very large open-structured zeolite nanosheet assemblies with extraordinary micropore accessibility
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DOI：
10.1016/j.micromeso.2022.111854
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发表时间：
2022-04-03
影响因子：
5.2
通讯作者：
Dong, Junhang
中科院分区：
文献类型：
--
作者：
Cao, Zishu;Iskhakova, Landysh;Dong, Junhang
沸石纳米片（ZN）为增强的分子催化和分离提供改进的吸附和传输性质。然而，由于缺乏有效的合成方法，ZN材料的实际应用受到阻碍。在这里，一个锌自接种的方法证明了非常大的MFI锌板的花状组件的单步复制。ZN板是约60 nm厚的4 nm厚的单晶片的堆叠。ZN花生长涉及在种子表面上的平台成核和随后的ZN外延生长在[010]取向由双季铵试剂指导。组件的开放结构防止了热活化期间ZN的塌陷和团聚，这有效地保持了互连的片内和片间的微结构系统。因此，ZN组件表现出显着增强的分子吸附能力和传输扩散的探测二甲苯分子相比，传统的晶体。ZN组件及其可收获的超大尺寸ZN具有开发高性能ZN吸附剂、催化剂和分子筛膜的潜力。
Zeolite nanosheets (ZNs) offer improved micropore accessibilities and transport properties for enhanced molecular catalysis and separations. However, practical application of the ZN materials is hampered by the lack of efficient synthesis methods. Here, a ZN self-seeded method is demonstrated for single-step reproduction of flower-like assemblies of very large MFI ZN plates. The ZN plates are ~60 nm-thick stacks of 4-nm-thick single crystal sheets. The ZN flower growth involves terrace nucleation on the seed surfaces and subsequent ZN epitaxial growth in [010] orientation directed by a diquaternary agent. The open architecture of the assemblies prevented collapse and agglomeration of ZNs during thermal activation that effectively preserved the interconnected intra-sheet and inter-sheet micropore system. Thus, the ZN assemblies exhibited markedly enhanced molecular adsorption capacity and transport diffusivity for the probing xylene molecules as compared to the conventional crystals. The ZN assembly and its harvestable very large-sized ZNs have the potential for developing high-performance ZN adsorbents, catalysts, and molecular-sieve membranes.