A successful incorporation of boron into *BEA zeolite framework has been achieved using a in situ hydrothermal synthesis in the presence of aluminum-*BEA seeds. Interestingly, the boron-*BEA crystals exhibited a cubic morphology with a remarkable decrease in the crystal size as compared with Al-*BEA seeds. The effect of boron addition on *BEA zeolite acidity was investigated by NH₃-TPD and pyridine FTIR. The type of boron coordination in the framework of *BEA zeolite was observed by ¹¹B MAS NMR. The results confirmed the formation of tetrahedral (BO₄) and trigonal (BO₃) boron species. The catalyst with highest boron content (Si/B = 6) showed the best catalytic transformation of methanol to olefins and the lowest deactivation rate. Moreover, it showed the highest propylene selectivity of 60% as well as the highest propylene-to-ethylene ratio (P/E) of 7.5.

在铝-* BEA晶种存在下，使用原位水热合成技术已经成功地将硼掺入* BEA沸石骨架中。有趣的是，与Al- * BEA晶种相比，硼-* BEA晶体表现出立方晶形，且晶体尺寸显着减小。通过NH ₃ -TPD和吡啶FTIR研究了硼添加对* BEA沸石酸度的影响。通过¹¹ B MAS NMR观察到* BEA沸石骨架中的硼配位类型。结果证实形成了四面体（BO ₄）和三角体（BO ₃）硼物种。硼含量最高（Si / B = 6）的催化剂表现出甲醇向烯烃的最佳催化转化和最低的失活速率。此外，它显示出60％的最高丙烯选择性以及7.5的最高丙烯/乙烯比（P / E）。