This study attempts to identify the active structure and the catalytic efficiency of MCM-22 zeolite after the successful removal of pre-synthesized MCM-22(P) template by two different methods. The MCM-22(P) zeolite was firstly synthesized by hydrothermal process with a SiO₂/Al₂O₃ ratio of 50, and its 2D layered hexamethyleneimine (HMI) precursor template was removed by (i) thermal calcination at high temperature (550 °C) to obtain the MCM-22(C), and (ii) oxidation with H₂O₂ treatment at low temperature (90 °C) to obtain the MCM-22(H₂O₂). The structural characteristics of MCM-22(C) and the MCM-22(H₂O₂) were identified by XRD, N₂ absorption/desorption, FTIR, NH₃-TPD and ²⁷Al MAS-NMR. The catalytic performance of MCM-22(C) and MCM-22(H₂O₂) loaded by 20 wt% zinc nanoparticles were examined through a Friedel-Grafts (FC) alkylation of benzene with benzyl chloride in a liquid phase environment. It was found that Zn-MCM-22(H₂O₂) was more efficient in FC alkylation reaction in comparison with Zn-MCM-22(C) for the formation of intercrystal pores due to the inhibitory influence of silonal group condensation on the external surface of MCM-22 crystals.

本研究试图通过两种不同的方法成功去除预先合成的 MCM-22(P) 模板后，确定 MCM-22 沸石的活性结构和催化效率。MCM-22(P)沸石首先通过水热法合成，SiO ₂ /Al ₂ O ₃比为50，其二维层状六亚甲基亚胺（HMI）前驱体模板通过（i）高温（550 °C) 获得 MCM-22(C)，以及 (ii)在低温 (90 °C) 下用 H ₂ O ₂处理氧化以获得 MCM-22(H ₂ O ₂ )。MCM-22(C)和MCM-22(H ₂ O ₂ )的结构特征)通过XRD、N ₂吸收/解吸、FTIR、NH ₃ -TPD和²⁷ Al MAS-NMR鉴定。在液相环境中，通过苯与苄基氯的弗瑞德-接枝 (FC) 烷基化，研究了负载 20 wt% 锌纳米颗粒的 MCM-22(C) 和 MCM-22(H ₂ O ₂ )的催化性能。结果表明，与 Zn-MCM-22(C) 相比，Zn-MCM-22(H ₂ O ₂ ) 在 FC 烷基化反应中更有效地形成晶间孔，这是由于硅烷基团缩合对晶间孔的抑制影响。 MCM-22 晶体的外表面。