摘要
Hierarchical porous zeolites attract great at- tention because of their porosity on different scales to improve molecular diffusion. Here, we report mesoporous Faujasite （FAU） zeolite nanosheets with intergrown structure synthe- sized in an additive-free system. The sample was composed of uniform nanosheets with a slice thickness of -50 nm, which held a honeycomb-like structure with abundant mesopores. This material exhibits both microporous and mesoporous structure： the intrinsic micropores with a diameter about 0.74 nm in the zeolite framework and the mesopores with a diameter about 10 nm existing within the zeolite nanosheets. The Si/AI ratios can be adjusted from I.I to 1.9 （zeolites X or Y）. In addition, this simple and environment-friendly method may provide inspiration to the synthesis of other hierarchical zeolites.
本文用无添加剂体系合成了具有共生结构的介孔FAU沸石.该材料具有由约50纳米厚度的纳米片堆积形成的花状形貌,而且具有两种孔道体系:沸石骨架本身的微孔和存在于纳米片内部的晶间介孔.通过对合成条件精确的控制以及对反应物比例的筛选,分别合成了介孔X型(硅铝比<1.5)和Y型(硅铝比>1.5)沸石.温和的温度以及高碱度使得在成核初期发生结晶-溶解-重结晶过程是形成介孔FAU沸石的关键条件.该合成体系用简单和低成本的方法在FAU沸石中引入介孔,有望突破沸石在大分子催化中的限制,将有可能应用于工业化生产.
作者
Xiaoli Jia
Lu Han
Yanhang Ma
Shunai Che
贾晓利;韩璐;马延航;车顺爱(School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China)
基金
supported by the National Natural Science Foundation of China(21533002 and 21571128)
the National Excellent Doctoral Dissertation of China(201454)
