Chen Li, Xue Teng, Wu Haihong, Wu Peng
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 P. R. China
RSC Adv. 2018 Jan 17;8(5):2751-2758. doi: 10.1039/c7ra12811h. eCollection 2018 Jan 9.
Hierarchical ZSM-5 zeolite aggregates were synthesized in an organic-template-free system seed-induced crystallization. The obtained samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N adsorption-desorption, NH temperature-programmed desorption (NH-TPD) and inductively coupled plasma atomic emission spectrometry (ICP-AES). The prepared ZSM-5 nanocrystalline aggregates possessed open/accessible hierarchical pores and active sites, showing significant advantages in the catalytic alkylation of phenol with -butanol. The obtained materials could maintain the activities of the nanocrystal zeolites and meanwhile could be easily separated or recovered during the preparation and reactions. This approach was simple and also overcame the commonly-seen drawbacks such as the exceeded use of specific templates or secondary templates during the synthesis of the hierarchical zeolites.
在无有机模板体系中通过种子诱导结晶合成了分级ZSM-5沸石聚集体。使用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、N吸附-脱附、NH3程序升温脱附（NH3-TPD）和电感耦合等离子体原子发射光谱法（ICP-AES）对所得样品进行了表征。制备的ZSM-5纳米晶聚集体具有开放/可及的分级孔道和活性位点，在苯酚与叔丁醇的催化烷基化反应中显示出显著优势。所得材料可以保持纳米晶沸石的活性，同时在制备和反应过程中易于分离或回收。该方法简单，还克服了分级沸石合成过程中常见的缺点，如特定模板或二次模板的过度使用。
