The minimized diffusion limitation and completely exposed strong acid sites of the ultrathin zeolites make it an industrially important catalyst especially for converting bulky molecules. However, the structure-controlled and large-scale synthesis of the material is still a challenge. In this work, the direct synthesis of the single-layer MWW zeolite was demonstrated by using hexamethyleneimine and amphiphilic organosilane as structure-directing agents. Characterization results confirmed the formation of the single-layer MWW zeolite with high crystallinity and excellent thermal/hydrothermal stability. The formation mechanism was rigorously revealed as the balanced rates between the nucleation/growth of the MWW nanocrystals and the incorporation of the organosilane into the MWW unit cell, which is further supported by the formation of MWW nanosheets with tunable thickness via simply changing synthesis conditions. The commercially available reagents, well-controlled structure and the high catalytic stability for the alkylation of benzene with 1-dodecene make it an industrially important catalyst.

中文翻译：

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单层至多层MWW沸石的受控直接合成


超细沸石的最小化扩散限制和完全暴露的强酸位点使其成为工业上重要的催化剂，特别是用于转化大分子。然而，该材料的结构控制和大规模合成仍然是一个挑战。在这项工作中，通过使用六亚甲基亚胺和两亲性有机硅烷作为结构导向剂，演示了单层MWW沸石的直接合成。表征结果证实了单层MWW沸石的形成，具有高结晶度和优异的热/水热稳定性。其形成机制被严格揭示为MWW纳米晶体的成核/生长与有机硅烷并入MWW晶胞之间的平衡速率，通过简单改变合成条件形成具有可调厚度的MWW纳米片进一步支持了这一机制。商业化的试剂、良好控制的结构以及苯与1-十二碳烯烷基化反应的高催化稳定性使其成为工业上重要的催化剂。