Synthesis and characterization of composite molecular sieves with mesoporous and microporous structure from ZSM-5 zeolites by heat treatment
Synthesis and characterization of composite molecular sieves with mesoporous and microporous structure from ZSM-5 zeolites by heat treatment
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DOI：
10.1016/s1387-1811(03)00427-x
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发表时间：
2003-08
影响因子：
5.2
通讯作者：
Cunman Zhang;Qian Liu;Zheng Xu;K. Wan
中科院分区：
文献类型：
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作者：
Cunman Zhang;Qian Liu;Zheng Xu;K. Wan
在确定的温度下处理商业ZSM-5沸石（Si/Al分别为50和19）n小时。经过不同条件的热处理，得到了一种具有双峰孔结构的ZSM-5分子筛，该分子筛保留了ZSM-5分子筛原有的微孔结构，但在同一基体中形成了孔径分布较窄的中孔。实验表明，热处理条件对中微孔复合分子筛的性能有很大的影响。采用N2吸附、XRD、SEM和HRTEM等手段对改性后的ZSM-5分子筛的微观结构和物理性能进行了研究。该工艺具有成本低、易于控制、重复性好等优点，为制备双峰多孔材料提供了一种简便的方法。
The commercial ZSM-5 zeolites (Si/Al=50 and 19 respectively) were treated for n hours at determinate temperatures. After the heat treatment under different conditions, a new kind of ZSM-5 with bimodal pore was developed, in which the part of original microporous structure in ZSM-5 was remained, but some of mesopores with narrow pore size distribution were formed in the same matrix. The experiments showed that the characteristics of the composite molecular sieves with mesopores and micropores strongly depended on the heat treatment conditions. To evaluate the new molecular sieves, microstructure and physical properties of the treated ZSM-5 were investigated by N2sorption, XRD, SEM and HRTEM. The process developed in the present work provides a convenient method to prepare bimodal porous material with advantages of low cost, easy control and good repeatability.