The development of the mesoporosity of zeolite frameworks is an effective method to enhance the catalytic performance in the methanol-to-olefin reaction. Mesopore-containing CON-type boroaluminosilicate zeolite was prepared by the alkaline treatment based on the post-synthetic hydrothermal treatment in NH₄OH solution containing cetyltrimethylammonium bromide. The change in the concentration of NH₄OH solution led to CON zeolites with different mesopore volumes. The effects of the NH₄OH concentration on the structural properties of the treated samples were investigated by XRD, N₂ adsorption, SEM, TEM, and ¹¹B, ²⁷Al, and ²⁹Si MAS NMR analyses. In addition, in situ FTIR with pyridine and 2,4,6-trimethylpyridine as probe molecules was applied to investigate the acidic properties. In the methanol-to-olefin (MTO) reaction, the mesopore-containing CON-type zeolite showed a longer catalytic life than the parent zeolite. The enhanced catalytic properties could be attributed to the dual effects of the alkaline treatment on the porosity and acidity modification.

中文翻译：

---

具有独特的酸性和催化特性的中孔含CON型沸石的开发

沸石骨架的中孔性的发展是增强甲醇-烯烃反应中催化性能的有效方法。通过在包含十六烷基三甲基溴化铵的NH ₄ OH溶液中进行合成后的水热处理，通过碱处理来制备含介孔的CON型硼铝硅酸盐沸石。NH ₄ OH溶液浓度的变化导致CON沸石具有不同的中孔体积。通过XRD，N ₂吸附，SEM，TEM和¹¹ B，²⁷ Al和²⁹ Si MAS NMR分析，研究了NH ₄ OH浓度对处理样品的结构性能的影响。此外，以吡啶和2,4,6-三甲基吡啶为探针分子进行原位FTIR研究了其酸性。在甲醇制烯烃（MTO）反应中，含中孔的CON型沸石显示出比母体沸石更长的催化寿命。增强的催化性能可以归因于碱处理对孔隙率和酸性改变的双重影响。