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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 
单位:辽宁石油化工大学石化学院 辽宁 抚顺 113001 
关键词:Al–Z–SBA–15 介孔分子筛 制备条件 有序度 催化活性 
分类号:TQ426
出版年,卷(期):页码:2016,44(10):0-0
DOI:10.14062/j.issn.0454-5648.2016.10.27
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,XRD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(XRD)、FT–IR、N2吸附–脱附和吡啶红外等方法对Al–Z–SBA–15的理化性质进行了表征分析。结果表明,当ZSM–5的Si/Al=80、降解时间24 h、硝酸铝引入量为35(nTEOS:nAl(NO3)3)、晶化温度120 ℃、晶化时间48 h,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取代硅物种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均显著提高。

The composite molecular sieves of Al–Z–SBA–15 were synthesized direct synthesis method. The influences of mass ratio of ZSM–5, amount of zeolite–dissolving solution, time of zeolite–dissolving, amount of aluminum nitrate, crystallization temperature and crystallization time on generating composite molecular sieves were investigated in the mesoporous structure and acidity by the esterification reaction of acrylic acid and XRD.The samples were characterized by means of XRD, FT–IR, N2 adsorption–desorption and py–FTIR, the results showed that when the silica alumina ratio was 80, zeolite–dissolving time was 24 h, amount of aluminum nitrate (nTEOS:naluminum nitrate)was 35, reaction temperature was 120 ℃ and reaction time was 48 h, the Al–Z–SBA–15 composite molecular sieves showed better performance of order degree and acidity. And the units of zeolit were SBA–15 mesoporous material with Al—O—Si pore walls, which played role in helping to increase the pore wall thickness. Most of the aluminum atoms were incorporated into the framework of Al–Z–SBA–15.Compared with Z–SBA–15, the catalytic activity and hydrothermal stability of Al–Z–SBA–15 were significantly improved.
 

基金项目:
作者简介:
孙 尧(1990—),女,硕士研究生。
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