Abstract: Nanocrystalline ZSM⁃5 zeolites were synthesized by hydrothermal synthesis using 30% silica sol as silica source and aluminium sulfate as aluminium source. The obtained samples were characterized by XRD, SEM, BET and NH3⁃TPD characterization methods, and the effects of different pH on the physico⁃chemical properties of nanocrystalline accumulation ZSM⁃5 molecular sieve were investigated. The results showed that when the pH value was 11.50, the catalyst had nano⁃scale structure, large surface area, large number of mesopores and suitable acidity. The application of thiophene alkylation showed better thiophene alkylation activity.

Key words: Molecular sieve, Hydrothermal synthesis, Nanoscale, Accumulation, Thiophene alkyatation

摘要： 以质量分数为30%硅溶胶为硅源，硫酸铝为铝源，采用水热合成法合成了纳米晶堆积ZSM⁃5分子筛，并通过XRD、SEM、BET和NH⁃TPD表征方法对所得样品进行表征，考察不同pH对纳米晶堆积ZSM⁃5分子筛物化性质的影响。结果表明，当pH为11.50时，催化剂的粒径为纳米级结构，表面积较大，介孔数量多，酸性适宜，应用到噻吩烷基化反应后，表现出较好的噻吩烷基化活性。

关键词: ZSM?5分子筛, 水热合成, 纳米级, 堆积, 噻吩烷基化