Regulating heteroatom-substituted tetrahedral sites (T sites) within a zeolite crystal significantly influences the zeolite properties. Herein, the as-synthesized MFI zeolite with tailored boron locations at various T sites is unveiled by powder X-ray crystallography. The experimental results imply that four similar but structurally different imidazolium-based organic structure-directing agents (OSDAs) adopted in the synthetic system can effectively control the location of final boron-enriched T sites. It is demonstrated that the specific boron location depends on the corresponding OSDA coordinates and their molecular structures. Furthermore, boron-enriched composite building units in the MFI framework are derived as well. Such boron-enriched T sites tailored by zeolite framework (host) and OSDA molecule (guest) interactions afford an effective strategy for the rational design of zeotype catalysts.

中文翻译：

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通过咪唑基分子将硼原子锚定到硼硅酸盐 MFI 的特定四面体位点

调节沸石晶体内的杂原子取代的四面体位点 (T 位点) 会显着影响沸石的性质。在此，通过粉末 X 射线晶体学揭示了在不同 T 位点具有定制硼位置的合成MFI沸石。实验结果表明，合成系统中采用的四种相似但结构不同的咪唑基有机结构导向剂（OSDA）可以有效控制最终富硼T位点的位置。已证明特定的硼位置取决于相应的 OSDA 坐标及其分子结构。此外， MFI中的富硼复合建筑单元框架也是派生出来的。这种由沸石骨架（主体）和 OSDA 分子（客体）相互作用定制的富硼 T 位点为合理设计 zeotype 催化剂提供了有效的策略。