硅酸盐学报

Al–Z–SBA–15复合分子筛的制备及催化性能

作者：孙尧詹金友张璐璐沈健李剑

分类号：TQ426

出版年,卷(期):页码：2016,44(10):1515-1521

DOI：10.14062/j.issn.0454-5648.2016.10.20

摘要：

采用直接合成法制备Al–Z–SBA–15复合分子筛，以丙烯酸酯化反应为探针，X射线衍射表征为手段，考察ZSM–5的硅铝比、降解时间、硝酸铝引入量、晶化温度、晶化时间对复合分子筛的结构和酸性的影响。利用X射线衍射、Fourier变换红外光谱、N2吸附–脱附和吡啶红外光谱对Al–Z–SBA–15的理化性质进行了表征分析。结果表明：当ZSM–5中的Si/Al摩尔比为80、降解时间为24 h、正硅酸乙酯与硝酸铝的摩尔比为35、晶化温度为120 ℃、晶化时间为48 h时，Al–Z–SBA–15有序度最高，酸性最强；沸石结构单元以五元环的形式存在于骨架中，增加了孔壁厚度，大部分Al取代硅以稳定的骨架铝的形式嵌入到孔壁中，提高了孔壁的结晶度。与Z–SBA–15相比，Al–Z–SBA–15催化活性和水热稳定性显著提高。

Composite molecular sieves Al–Z–SBA–15 were synthesized by a direct synthesis method. The influences of mass ratio of ZSM–5, relative amount of aluminum nitrate, time of zeolite–dissolving, crystallization temperature and crystallization time on the synthesis of composite molecular sieves were investigated. The samples were characterized by X–ray diffraction, Fourier transform infrared spectroscopy(FTIR, N2 adsorption–desorption analysis and pyridine–adsorbed FTIR, respectively. The results show that the composite molecular sieves Al–Z–SBA–15 prepared under the optimum condition (i.e., silica alumina ratio in ZSM-5 of 80, zeolite–dissolving
time of 24 h, relative amount of aluminum nitrate () of 35, reaction temperature of 120 ℃ and reaction time of 48 h)
have better performance of order degree and acidity. The fivefold ring structural unit of zeolite existing in the framework increases the pore wall thickness of the molecular sieve, and most of the aluminum atoms are incorporated into the framework of Al–Z–SBA–15. Compared to Z–SBA–15, the catalytic activity and hydrothermal stability of Al–Z–SBA–15 are significantly improved.

基金项目：

作者简介：

孙尧(1990—)，女，硕士研究生。

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